7Baggers

Contura Energy, Inc
(NYSE:CTRA) 

CTRA stock logo

Contura Energy, Inc. extracts, processes, and markets metallurgical and thermal coal to electric utilities, steel and coke producers, and industrial customers in the United States. The company operates in three segments: CAPP - Met, CAPP - Thermal, and NAPP. It operates 21 underground, eight coal mi...

Founded: 2016
Full Time Employees: 3,900
Sector: Energy
Industry: Thermal Coal
MaterialsCoalEnergy
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At a glance:
Bull Thesis:
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Moat:
Income Statements:
Quarterly
Annual
    Unit: USD2026-03-31 2025-09-30 2024-03-31 2023-09-30 2023-06-30 2023-03-31 2022-09-30 2022-06-30 2022-03-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 
                          
      revenues:
    		                      
      coal revenues
    		523,533,000 525,203,000 861,283,000 738,998,000 853,807,000 906,698,000 867,849,000 1,334,258,000 1,069,738,000 647,129,000 393,458,000 385,452,000 134,189,000 399,954,000 410,614,000 468,367,000 497,232,000 523,987,000 653,828,000 606,960,000 574,351,000 443,005,000 
      other revenues
    		1,454,000 1,575,000 2,789,000 2,822,000 4,564,000 4,537,000 1,919,000 2,154,000 2,226,000 1,712,000 1,817,000 801,000 -991,000 737,000 1,224,000 2,093,000 1,844,000 1,877,000 2,378,000 2,154,000 -2,267,000 4,866,000 
      total revenues
    		524,987,000 526,778,000 864,072,000 741,820,000 858,371,000 911,235,000 869,768,000 1,336,412,000 1,071,964,000 648,841,000 395,275,000 386,253,000 133,198,000 400,691,000 411,838,000 470,460,000 499,076,000 525,864,000 656,206,000 609,114,000 572,084,000 447,871,000 
      yoy
    		-38.84% -42.19% -0.65% -44.49% -19.93% 40.44% 120.04% 245.99% 704.79% 61.93% -4.02% -17.90% -73.31% -23.80% -37.24% -22.76% -12.76% 17.41%     
      qoq
    		-0.34% -39.04% 16.48% -13.58% -5.80% 4.77% -34.92% 24.67% 65.21% 64.15% 2.34% 189.98% -66.76% -2.71% -12.46% -5.73% -5.09% -19.86% 7.73% 6.47% 27.73%  
      costs and expenses:
    		                      
      cost of coal sales
    		474,389,000 461,635,000 648,313,000 564,608,000 583,514,000 539,137,000 555,502,000 625,892,000 555,317,000 488,169,000 346,763,000 347,428,000 132,595,000 367,277,000 383,279,000 397,860,000 444,611,000 467,658,000 496,746,000 438,510,000 361,173,000 307,689,000 
      depreciation, depletion and amortization
    		39,926,000 43,899,000 40,701,000 32,582,000 32,226,000 29,423,000 27,925,000 27,730,000 28,035,000 24,519,000 27,304,000 28,438,000 -14,581,000 50,739,000 49,262,000 54,465,000 43,865,000 60,842,000 62,814,000 61,271,000 43,598,000 11,141,000 
      accretion on asset retirement obligations
    		5,215,000 5,503,000 6,143,000 6,376,000 6,376,000 6,377,000 5,921,000 5,947,000 5,954,000 6,674,000 6,648,000 6,648,000 2,698,000 9,127,000 7,304,000 7,375,000 7,873,000 6,846,000 6,847,000 6,232,000   
      amortization of acquired intangibles
    		876,000 1,357,000 1,675,000 2,069,000 2,192,000 2,197,000 4,543,000 5,747,000 5,748,000 2,980,000 2,553,000 3,869,000 4,034,000 2,219,000 2,096,000 865,000 4,624,000 2,314,000 -343,000 -6,683,000 -17,860,000 1,158,000 
      selling, general and administrative expenses
    		16,598,000 15,697,000 22,377,000 18,053,000 17,506,000 20,692,000 15,095,000 18,158,000 15,086,000 15,264,000 14,645,000 14,982,000 15,346,000 14,501,000 12,028,000 15,481,000 25,832,000 17,387,000 14,783,000 20,951,000 15,781,000 12,382,000 
      other operating loss
    		-1,585,000 1,209,000 2,985,000                    
      total costs and expenses
    		535,419,000 529,300,000 722,194,000 624,661,000 640,268,000 596,734,000 608,745,000 686,166,000 618,873,000 548,825,000 397,462,000 402,755,000 7,032,000 449,699,000 635,966,000 494,178,000 715,127,000 552,075,000 589,257,000 591,333,000 554,713,000 424,023,000 
      income from operations
    		-10,432,000 -2,522,000 141,878,000 117,159,000 218,103,000 314,501,000 261,023,000 650,246,000 453,091,000 100,016,000 -2,187,000 -16,502,000 126,166,000 -49,008,000 -224,128,000 -23,718,000 -216,051,000 -26,211,000 66,949,000 17,781,000 17,371,000 23,848,000 
      yoy
    		-104.78% -100.80% -45.65% -81.98% -51.86% 214.45% -12035.21% -4040.41% 259.12% -304.08% -99.02% -30.42% -158.40% 86.97% -434.77% -233.39% -1343.75% -209.91%     
      qoq
    		313.64% -101.78% 21.10% -46.28% -30.65% 20.49% -59.86% 43.51% 353.02% -4673.21% -86.75% -113.08% -357.44% -78.13% 844.97% -89.02% 724.28% -139.15% 276.52% 2.36% -27.16%  
      operating margin %
    		-1.99% -0.48% 16.42% 15.79% 25.41% 34.51% 30.01% 48.66% 42.27% 15.41% -0.55% -4.27% 94.72% -12.23% -54.42% -5.04% -43.29% -4.98% 10.20% 2.92% 3.04% 5.32% 
      other income:
    		                      
      interest expense
    		-841,000 -765,000 -1,086,000 -1,746,000 -1,856,000 -1,720,000 -1,695,000 -5,218,000 -13,083,000 -17,338,000 -17,962,000 -17,990,000 -19,720,000 -18,389,000 -18,814,000 -17,605,000 -16,719,000 -18,847,000 -16,077,000 -15,155,000 -12,272,000 -8,554,000 
      interest income
    		4,206,000 3,948,000 3,971,000 4,639,000 2,754,000 1,518,000 1,064,000 164,000 184,000 54,000 104,000 164,000 138,000 378,000 5,533,000 978,000 1,712,000 1,763,000 1,885,000 1,936,000 1,120,000 507,000 
      equity loss in affiliates
    		-5,733,000 -6,240,000 -1,640,000 -6,660,000 -3,174,000 -1,748,000 -4,821,000 -2,136,000 -1,361,000 -643,000 -384,000 -134,000 -388,000 -1,295,000 -1,047,000 -743,000 -2,070,000 -1,845,000 -2,475,000 -484,000 -3,255,000 -1,624,000 
      miscellaneous expense
    		-3,558,000 -3,266,000                     
      total other expense
    		-5,926,000 -6,323,000 -718,000 -4,381,000 -3,150,000 -1,319,000 -3,750,000 -5,805,000 -12,463,000 -16,115,000 -16,395,000 -16,194,000 -20,854,000 -19,674,000 -14,140,000 -18,278,000 -24,497,000 -20,452,000 -43,649,000 -14,569,000 -26,966,000 -9,825,000 
      income before income taxes
    		-16,358,000 -8,845,000 141,160,000 112,778,000 214,953,000 313,182,000                 
      income tax benefit
    		5,326,000 3,330,000       -39,624,000 -208,000 -8,000 5,000 -36,000 45,000 -33,000 2,188,000 48,677,000 3,102,000 1,000,000 4,778,000 165,496,000 -12,000 
      net income
    		-11,032,000 -5,515,000 126,995,000 93,814,000 181,355,000 270,771,000 252,817,000 574,157,000 400,891,000 83,264,000 -18,991,000 -32,928,000 -100,153,000 -68,637,000 -238,301,000 -39,808,000 -140,941,000 -68,532,000 -113,661,000 6,815,000 156,542,000 11,894,000 
      yoy
    		-106.08% -102.04% -49.77% -83.66% -54.76% 225.20% -1431.25% -1843.67% -500.28% -221.31% -92.03% -17.28% -28.94% 0.15% 109.66% -684.12% -190.03% -676.19%     
      qoq
    		100.04% -104.34% 35.37% -48.27% -33.02% 7.10% -55.97% 43.22% 381.47% -538.44% -42.33% -67.12% 45.92% -71.20% 498.63% -71.76% 105.66% -39.70% -1767.81% -95.65% 1216.14%  
      net income margin %
    		-2.10% -1.05% 14.70% 12.65% 21.13% 29.71% 29.07% 42.96% 37.40% 12.83% -4.80% -8.52% -75.19% -17.13% -57.86% -8.46% -28.24% -13.03% -17.32% 1.12% 27.36% 2.66% 
      basic loss per common share
    		-860                      
      diluted loss per common share
    		-860                      
      weighted-average shares – basic
    		12,800,037,000 13,015,413,000 13,002,127,000 13,633,640,000 14,362,072,000 15,266,895,000                 
      weighted-average shares – diluted
    		12,800,037,000 13,015,413,000 13,236,596,000 14,110,488,000 14,910,633,000 15,916,378,000                 
      basic income per common share
    		 -420 9,770 6,880 12,630 17,740                 
      diluted income per common share
    		 -420 9,590 6,650 12,160 17,010                 
      miscellaneous income
    		  -1,963,000 -614,000 -874,000 631,000 1,702,000 1,385,000 1,797,000 1,812,000 1,847,000 1,766,000        -866,000 -517,000 -154,000 
      income tax expense
    		  -14,165,000 -18,964,000 -33,598,000 -42,411,000 -5,437,000 -69,012,000               
      total other operating loss:
    		                      
      mark-to-market adjustment for acquisition-related obligations
    		      -2,954,000 4,208,000 9,361,000 11,676,000 3,157,000 3,176,000 4,675,000 3,624,000 -2,052,000 -14,997,000 -3,276,000 -3,238,000 1,014,000 1,936,000   
      other expense
    		   973,000   2,713,000      -515,750 -1,359,000 -124,000        
      other income
    		    -1,546,000 -1,092,000  -1,516,000 -628,000 -457,000 -3,608,000 -1,225,000    -580,000    -8,899,000   
      asset impairment and restructuring
    		           -561,000 -137,575,000 3,571,000 184,173,000        
      income from continuing operations before income taxes
    		      257,273,000 644,441,000 440,628,000 83,901,000     -238,268,000 -41,996,000 -240,548,000 -46,663,000 23,300,000 3,212,000 -9,595,000 14,023,000 
      net income from continuing operations
    		      251,836,000 575,429,000 401,004,000 83,693,000 -18,590,000 -32,691,000 105,276,000 -68,637,000 -238,301,000 -39,808,000 -191,871,000 -43,561,000 24,300,000 7,990,000 155,901,000 14,011,000 
      discontinued operations:
    		                      
      income from discontinued operations before income taxes
    		      1,273,000              -664,000 -2,117,000 
      income tax benefit from discontinued operations
    		      -292,000 380,000 33,000        -8,652,000 -13,455,000 25,906,000 415,000   
      income from discontinued operations
    		      981,000              641,000 -2,117,000 
      basic income per common share:
    		                      
      income from continuing operations
    		      14,710 31,310 21,590 4,540     -13,020 -2,180 -147.5 -2,290 1,270 420 12,310 1,450 
      loss from discontinued operations before income taxes
    		       -1,652,000 -146,000 -429,000 -401,000 -237,000     59,582,000 -11,516,000 -163,867,000 -1,590,000   
      loss from discontinued operations
    		       -1,272,000 -113,000 -429,000 -401,000 -237,000     50,930,000 -24,971,000 -137,961,000 -1,175,000   
      diluted income per common share:
    		                      
      loss from continuing operations before income taxes
    		          -18,582,000 -32,696,000 105,312,000 -68,682,000         
      basic and diluted loss per common share:
    		                      
      loss from continuing operations
    		          -1,010 -1,780 5,760 -3,750         
      weighted-average shares – basic and diluted
    		           18,361,444,000           
      merger-related costs
    		                      
      loss on modification and extinguishment of debt
    		                  -26,459,000    
      miscellaneous loss
    		            -884,000 -368,000 188,000 -908,000 -728,000 -1,523,000 -523,000    
      basic loss per common share:
    		                      
      asset impairment
    		               33,709,000 60,466,000 32,000 5,826,000    
      merger related costs
    		                263,750 68,000 156,000 831,000 46,736,000 1,181,000 
      other expenses
    		                -1,829,750 166,000 1,414,000  109,500 150,000 
      freight and handling costs
    		                   77,184,000 95,111,000 91,041,000 
      freight and handling revenues
    		                      
      secondary offering costs
    		                      
      gain on disposal of assets
    		                    -4,275,750 -601,000 
      gain on settlement of acquisition-related obligations
    		                    -170,000 -118,000 
      loss on early extinguishment of debt
    		                      
      bargain purchase gain
    		                      
      income tax expense from discontinued operations
    		                      
      weighted-average shares - basic
    		                    10,967,014,000 9,633,164,000 
      weighted-average shares - diluted
    		                    11,712,653,000 10,384,513,000 
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-09-30 2024-03-31 2023-09-30 2023-06-30 2023-03-31 2022-09-30 2022-06-30 2022-03-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 
                            
        assets
      		                      
        current assets:
      		                      
        cash and cash equivalents
      		317,231,000 408,519,000 269,386,000 296,059,000 312,400,000 222,507,000 404,430,000 161,732,000 159,455,000 78,283,000 72,337,000 92,236,000 139,227,000 161,434,000 238,438,000 227,056,000 212,793,000 152,638,000 249,597,000 181,953,000 233,599,000 238,129,000 
        short-term investments
      		49,646,000 49,405,000                     
        trade accounts receivable, net of allowance for credit losses of 2,858 and 2,519 as of march 31, 2026 and december 31, 2025, respectively
      		302,136,000                      
        inventories
      		213,102,000 210,030,000 246,033,000 271,805,000 270,461,000 266,678,000 178,559,000 167,192,000 161,753,000 124,534,000 144,416,000 108,871,000 108,051,000 124,245,000 143,198,000 184,445,000 162,659,000 172,591,000 164,303,000 145,058,000 121,965,000 58,496,000 
        prepaid expenses and other current assets
      		27,360,000 32,808,000 34,868,000 41,945,000 56,431,000 50,448,000 76,999,000 57,853,000 57,144,000 31,723,000 108,515,000 106,909,000 106,252,000 120,939,000 122,354,000 142,151,000 91,361,000 181,903,000 166,702,000 150,914,000 158,945,000 45,915,000 
        total current assets
      		909,475,000 989,944,000 1,076,509,000 1,048,946,000 1,078,307,000 1,092,487,000 1,147,397,000 1,108,677,000 1,014,573,000 571,218,000 534,118,000 525,574,000 510,135,000 586,289,000 687,810,000 799,029,000 711,479,000 770,464,000 862,686,000 820,418,000 829,601,000 518,820,000 
        property, plant, and equipment, net of accumulated depreciation and amortization of 805,966 and 774,101 as of march 31, 2026 and december 31, 2025, respectively
      		625,145,000                      
        owned and leased mineral rights, net of accumulated depletion and amortization of 157,070 and 150,616 as of march 31, 2026 and december 31, 2025, respectively
      		410,489,000                      
        other acquired intangibles, net of accumulated amortization of 43,948 and 43,072 as of march 31, 2026 and december 31, 2025, respectively
      		33,576,000                      
        long-term restricted cash
      		127,217,000 125,796,000 121,927,000 83,004,000 71,299,000 50,931,000 31,724,000 24,920,000 118,476,000 84,001,000 92,758,000 85,640,000 96,033,000 124,065,000 109,930,000 101,815,000 122,524,000 209,041,000 216,568,000 233,488,000 227,173,000 36,882,000 
        long-term restricted investments
      		34,399,000 34,201,000 38,055,000 71,269,000 75,961,000 90,428,000 92,384,000 94,794,000               
        deferred income taxes
      		8,210,000 6,981,000 8,284,000 9,080,000 9,422,000 10,497,000 11,723,000 12,934,000 4,993,000 479,000 483,000 474,000     33,065,000 50,516,000 54,466,000 34,438,000 27,179,000 78,744,000 
        other non-current assets
      		133,926,000 116,790,000 113,601,000 105,749,000 104,770,000 106,957,000 93,332,000 94,617,000 96,673,000 126,502,000 134,781,000 148,170,000 149,382,000 221,591,000 220,389,000 212,548,000 204,207,000 189,545,000 198,449,000 188,237,000 183,675,000 38,605,000 
        total assets
      		2,282,437,000 2,345,299,000 2,460,809,000 2,352,960,000 2,357,832,000 2,349,117,000 2,259,853,000 2,216,146,000 2,112,999,000 1,675,951,000 1,662,783,000 1,671,641,000 1,680,089,000 1,923,123,000 2,040,238,000 2,291,917,000 2,302,823,000 2,669,888,000 2,779,790,000 2,756,051,000 2,746,058,000 906,625,000 
        liabilities and stockholders’ equity
      		                      
        current liabilities:
      		                      
        current portion of long-term debt
      		3,231,000 2,119,000 3,392,000 3,438,000 3,486,000 3,562,000 1,711,000 1,927,000 2,434,000 7,976,000 29,404,000 29,447,000 28,830,000 44,864,000 30,390,000 29,529,000 28,485,000 28,982,000 28,885,000 43,105,000 42,743,000 4,791,000 
        trade accounts payable
      		92,984,000 83,355,000 151,453,000 121,472,000 106,216,000 122,738,000 101,584,000 100,957,000 109,413,000 90,335,000 97,938,000 97,902,000 58,413,000 75,836,000 70,027,000 93,953,000 98,746,000 98,607,000 89,214,000 109,854,000 114,568,000 79,360,000 
        accrued expenses and other current liabilities
      		151,772,000 165,061,000 186,444,000 190,119,000 185,738,000 189,927,000 203,902,000 200,268,000 223,222,000 160,732,000 154,067,000 134,873,000 140,406,000 153,372,000 161,453,000 146,527,000 154,282,000 148,984,000 157,948,000 150,812,000 147,348,000 56,020,000 
        total current liabilities
      		247,987,000 250,535,000 341,289,000 315,210,000 295,736,000 316,608,000 341,342,000 345,467,000 360,926,000 292,404,000 311,376,000 289,603,000 259,054,000 292,278,000 291,889,000 303,220,000 315,152,000 330,177,000 326,405,000 355,194,000 355,236,000 176,036,000 
        long-term debt
      		8,977,000 2,854,000 6,034,000 7,064,000 7,761,000 8,379,000 2,987,000 2,762,000 248,936,000 497,191,000 550,263,000 550,314,000 553,697,000 552,676,000 597,706,000 623,474,000 564,481,000 563,846,000 580,519,000 540,387,000 545,269,000 361,770,000 
        workers’ compensation and black lung obligations
      		189,527,000 178,233,000 186,023,000 180,072,000 183,003,000 185,204,000 200,827,000 202,402,000 204,470,000 228,858,000 231,029,000 229,691,000 230,081,000 263,517,000 266,390,000 258,712,000 260,778,000 260,070,000 245,972,000 248,134,000 249,294,000  
        pension obligations
      		83,281,000 87,995,000 101,800,000 90,938,000 106,844,000 102,700,000 152,184,000 155,467,000 155,895,000 191,888,000 198,549,000 211,722,000 218,671,000 186,089,000 198,582,000 204,605,000 204,086,000 176,389,000 180,274,000 179,444,000 180,802,000  
        asset retirement obligations
      		203,632,000 187,216,000 172,758,000 148,100,000 146,817,000 144,851,000 135,082,000 133,946,000 133,719,000 141,925,000 140,840,000 140,675,000 140,074,000 210,998,000 207,001,000 189,459,000 184,130,000 223,156,000 217,830,000 215,415,000 203,694,000 55,821,000 
        other non-current liabilities
      		21,367,000 20,832,000 20,535,000 18,221,000 17,642,000 18,514,000 20,794,000 20,274,000 22,624,000 29,403,000 28,444,000 27,850,000 28,072,000 54,943,000 50,583,000 27,577,000 31,393,000 35,161,000 40,596,000 39,126,000 52,415,000 61,686,000 
        total liabilities
      		765,482,000 753,175,000 869,665,000 794,887,000 791,098,000 800,542,000 888,184,000 896,573,000 1,183,152,000 1,427,854,000 1,500,452,000 1,501,480,000 1,479,987,000 1,580,155,000 1,630,823,000 1,638,082,000 1,606,701,000 1,800,950,000 1,812,569,000 1,675,407,000 1,674,918,000 667,413,000 
        commitments and contingencies
      		                      
        stockholders’ equity
      		                      
        preferred stock - par value 0.01, 5,000,000 shares authorized, none issued
      		                      
        common stock - par value 0.01, 50,000,000 shares authorized, 22,494,813 issued and 12,752,824 outstanding at march 31, 2026 and 22,437,379 issued and 12,805,909 outstanding at december 31, 2025
      		225,000                      
        additional paid-in capital
      		855,765,000 848,838,000 830,536,000 825,143,000 818,221,000 813,299,000 811,012,000 807,603,000 788,281,000 783,781,000 782,586,000 781,606,000 779,424,000 778,728,000 777,650,000 776,607,000 775,707,000 770,822,000 768,046,000   49,407,000 
        accumulated other comprehensive loss
      		-58,698,000 -48,083,000 -39,837,000 -16,343,000 -15,891,000 -12,650,000 -60,886,000 -61,704,000 -57,728,000 -98,908,000 -100,321,000 -110,501,000 -111,985,000 -68,614,000 -69,747,000 -62,626,000  -22,140,000 -22,076,000   -1,959,000 
        treasury stock
      		-1,364,022,000 -1,320,825,000 -1,295,639,000 -1,051,185,000 -949,202,000 -791,557,000   -130,068,000 -107,800,000 -107,694,000 -107,694,000  -106,976,000 -106,955,000 -106,913,000       
        retained earnings
      		2,083,685,000 2,111,970,000 2,095,860,000            -191,739,000 46,562,000       
        total stockholders’ equity
      		1,516,955,000 1,592,124,000 1,591,144,000           342,968,000 409,415,000 653,835,000       
        total liabilities and stockholders’ equity
      		2,282,437,000 2,345,299,000 2,460,809,000           1,923,123,000 2,040,238,000 2,291,917,000       
        trade accounts receivable, net of allowance for credit losses of 2,542 and 2,396 as of september 30, 2025 and december 31, 2024, respectively
      		 289,182,000                     
        property, plant, and equipment, net of accumulated depreciation and amortization of 759,337 and 667,260 as of september 30, 2025 and december 31, 2024, respectively
      		 614,196,000                     
        owned and leased mineral rights, net of accumulated depletion and amortization of 146,498 and 124,965 as of september 30, 2025 and december 31, 2024, respectively
      		 421,583,000                     
        other acquired intangibles, net of accumulated amortization of 45,515 and 41,444 as of september 30, 2025 and december 31, 2024, respectively
      		 35,808,000                     
        common stock - par value 0.01, 50,000,000 shares authorized, 22,437,379 issued and 12,919,308 outstanding at september 30, 2025 and 22,383,325 issued and 13,016,390 outstanding at december 31, 2024
      		 224,000                     
        trade accounts receivable, net of allowance for credit losses of 217 and 234 as of march 31, 2024 and december 31, 2023, respectively
      		  526,222,000                    
        property, plant, and equipment, net of accumulated depreciation and amortization of 588,735 and 558,905 as of march 31, 2024 and december 31, 2023, respectively
      		  607,637,000                    
        owned and leased mineral rights, net of accumulated depletion and amortization of 106,429 and 99,826 as of march 31, 2024 and december 31, 2023, respectively
      		  449,892,000                    
        other acquired intangibles, net of accumulated amortization of 40,218 and 38,543 as of march 31, 2024 and december 31, 2023, respectively
      		  44,904,000                    
        common stock - par value 0.01, 50,000,000 shares authorized, 22,371,165 issued and 13,007,215 outstanding at march 31, 2024 and 22,058,135 issued and 12,938,679 outstanding at december 31, 2023
      		  224,000                    
        trade accounts receivable, net of allowance for credit losses of 250 and 239 as of september 30, 2023 and december 31, 2022, respectively
      		   432,401,000                   
        short-term deposits
      		   6,736,000 7,001,000 6,602,000                6,551,000 
        short-term restricted cash
      		                     8,853,000 
        property, plant, and equipment, net of accumulated depreciation and amortization of 547,451 and 491,186 as of september 30, 2023 and december 31, 2022, respectively
      		   539,904,000                   
        owned and leased mineral rights, net of accumulated depletion and amortization of 95,541 and 77,333 as of september 30, 2023 and december 31, 2022, respectively
      		   446,364,000                   
        other acquired intangibles, net of accumulated amortization of 47,498 and 53,719 as of september 30, 2023 and december 31, 2022, respectively
      		   48,644,000                   
        acquisition-related obligations – current
      		   181,000 296,000 381,000 30,131,000 36,211,000 21,281,000 26,266,000 22,866,000 19,879,000  18,206,000 30,019,000        
        preferred stock - par value 0.01, 5.0 million shares authorized, none issued
      		                      
        common stock - par value 0.01, 50.0 million shares authorized, 22.0 million issued and 13.4 million outstanding at september 30, 2023 and 21.7 million issued and 15.5 million outstanding at december 31, 2022
      		   220,000                   
        trade accounts receivable, net of allowance for credit losses of 205 and 239 as of june 30, 2023 and december 31, 2022, respectively
      		    432,014,000                  
        property, plant, and equipment, net of accumulated depreciation and amortization of 525,470 and 491,186 as of june 30, 2023 and december 31, 2022, respectively
      		    514,859,000                  
        owned and leased mineral rights, net of accumulated depletion and amortization of 89,403 and 77,333 as of june 30, 2023 and december 31, 2022, respectively
      		    452,501,000                  
        other acquired intangibles, net of accumulated amortization of 45,429 and 53,719 as of june 30, 2023 and december 31, 2022, respectively
      		    50,713,000                  
        common stock - par value 0.01, 50.0 million shares authorized, 21.9 million issued and 13.9 million outstanding at june 30, 2023 and 21.7 million issued and 15.5 million outstanding at december 31, 2022
      		    219,000                  
        trade accounts receivable, net of allowance for doubtful accounts of 369 and 239 as of march 31, 2023 and december 31, 2022, respectively
      		     546,252,000                 
        property, plant, and equipment, net of accumulated depreciation and amortization of 503,403 and 491,186 as of march 31, 2023 and december 31, 2022, respectively
      		     486,721,000                 
        owned and leased mineral rights, net of accumulated depletion and amortization of 83,313 and 77,333 as of march 31, 2023 and december 31, 2022, respectively
      		     458,191,000                 
        other acquired intangibles, net of accumulated amortization of 43,236 and 53,719 as of march 31, 2023 and december 31, 2022, respectively
      		     52,905,000                 
        common stock - par value 0.01, 50.0 million shares authorized, 21.8 million issued and 14.8 million outstanding at march 31, 2023 and 21.7 million issued and 15.5 million outstanding at december 31, 2022
      		     218,000                 
        trade accounts receivable, net of allowance for doubtful accounts of 375 and 393 as of september 30, 2022 and december 31, 2021, respectively
      		      487,352,000                
        current assets - discontinued operations
      		      57,000 70,000 69,000 1,391,000 2,157,000 3,216,000 10,935,000     3,401,000 2,059,000 22,806,000 22,475,000 22,179,000 
        property, plant, and equipment, net of accumulated depreciation and amortization of 497,149 and 443,856 as of september 30, 2022 and december 31, 2021, respectively
      		      404,171,000                
        owned and leased mineral rights, net of accumulated depletion and amortization of 73,446 and 52,444 as of september 30, 2022 and december 31, 2021, respectively
      		      423,763,000                
        other acquired intangibles, net of accumulated amortization of 50,259 and 34,221 as of september 30, 2022 and december 31, 2021, respectively
      		      58,561,000                
        non-current assets - discontinued operations
      		      8,521,000 8,508,000 8,526,000 9,477,000 9,477,000 9,476,000 9,473,000          
        current liabilities - discontinued operations
      		      4,014,000 6,104,000 4,576,000 7,095,000 7,101,000 7,502,000 12,306,000     20,439,000 17,298,000 21,854,000 21,892,000 20,850,000 
        acquisition-related obligations - long-term
      		        28,199,000 18,966,000 11,972,000 23,123,000 20,768,000 19,286,000 18,283,000 30,718,000 46,259,000 51,853,000 67,049,000 75,218,000 72,996,000 11,997,000 
        non-current liabilities - discontinued operations
      		      23,245,000 23,321,000 23,390,000 26,740,000 27,496,000 28,028,000 29,090,000     151,998,000 147,016,000 95,000 94,000 103,000 
        common stock - par value 0.01, 50.0 million shares authorized, 21.6 million issued and 16.3 million outstanding at september 30, 2022 and 20.8 million issued and 18.4 million outstanding at december 31, 2021
      		      217,000                
        trade accounts receivable, net of allowance for doubtful accounts of 473 and 393 as of june 30, 2022 and december 31, 2021, respectively
      		       721,830,000               
        property, plant, and equipment, net of accumulated depreciation and amortization of 478,210 and 443,856 as of june 30, 2022 and december 31, 2021, respectively
      		       392,074,000               
        owned and leased mineral rights, net of accumulated depletion and amortization of 66,891 and 52,444 as of june 30, 2022 and december 31, 2021, respectively
      		       429,854,000               
        other acquired intangibles, net of accumulated amortization of 45,716 and 34,221 as of june 30, 2022 and december 31, 2021, respectively
      		       62,702,000               
        common stock - par value 0.01, 50.0 million shares authorized, 21.6 million issued and 17.7 million outstanding at june 30, 2022 and 20.8 million issued and 18.4 million outstanding at december 31, 2021
      		       216,000               
        trade accounts receivable, net of allowance for doubtful accounts of 519 and 393 as of march 31, 2022 and december 31, 2021, respectively
      		        636,152,000              
        property, plant, and equipment, net of accumulated depreciation and amortization of 462,920 and 443,856 as of march 31, 2022 and december 31, 2021, respectively
      		        369,449,000              
        owned and leased mineral rights, net of accumulated depletion and amortization of 59,894 and 52,444 as of march 31, 2022 and december 31, 2021, respectively
      		        436,852,000              
        other acquired intangibles, net of accumulated amortization of 39,968 and 34,221 as of march 31, 2022 and december 31, 2021, respectively
      		        68,450,000              
        common stock - par value 0.01, 50.0 million shares authorized, 21.0 million issued and 18.5 million outstanding at march 31, 2022 and 20.8 million issued and 18.4 million outstanding at december 31, 2021
      		        210,000              
        trade accounts receivable, net of allowance for doubtful accounts of 325 and 293 as of september 30, 2021 and december 31, 2020
      		         335,287,000             
        property, plant, and equipment, net of accumulated depreciation and amortization of 436,205 and 382,423 as of september 30, 2021 and december 31, 2020
      		         356,305,000             
        owned and leased mineral rights, net of accumulated depletion and amortization of 48,968 and 35,143 as of september 30, 2021 and december 31, 2020
      		         449,901,000             
        other acquired intangibles, net of accumulated amortization of 31,349 and 25,700 as of september 30, 2021 and december 31, 2020
      		         78,547,000             
        common stock - par value 0.01, 50.0 million shares authorized, 20.8 million issued and 18.4 million outstanding at september 30, 2021 and 20.6 million issued and 18.3 million outstanding at december 31, 2020
      		         208,000             
        trade accounts receivable, net of allowance for doubtful accounts of 175 and 293 as of june 30, 2021 and december 31, 2020
      		          206,693,000            
        property, plant, and equipment, net of accumulated depreciation and amortization of 418,677 and 382,423 as of june 30, 2021 and december 31, 2020
      		          357,152,000            
        owned and leased mineral rights, net of accumulated depletion and amortization of 45,505 and 35,143 as of june 30, 2021 and december 31, 2020
      		          452,887,000            
        other acquired intangibles, net of accumulated amortization of 32,286 and 25,700 as of june 30, 2021 and december 31, 2020
      		          81,610,000            
        common stock - par value 0.01, 50.0 million shares authorized, 20.8 million issued and 18.4 million outstanding at june 30, 2021 and 20.6 million issued and 18.3 million outstanding at december 31, 2020
      		          208,000            
        trade accounts receivable, net of allowance for doubtful accounts of 470 and 293 as of march 31, 2021 and december 31, 2020
      		           214,342,000           
        property, plant, and equipment, net of accumulated depreciation and amortization of 400,505 and 382,423 as of march 31, 2021 and december 31, 2020
      		           361,120,000           
        owned and leased mineral rights, net of accumulated depletion and amortization of 40,976 and 35,143 as of march 31, 2021 and december 31, 2020
      		           457,416,000           
        other acquired intangibles, net of accumulated amortization of 29,651 and 25,700 as of march 31, 2021 and december 31, 2020
      		           84,245,000           
        common stock - par value 0.01, 50.0 million shares authorized, 20.7 million issued and 18.4 million outstanding at march 31, 2021 and 20.6 million issued and 18.3 million outstanding at december 31, 2020
      		           207,000           
        accumulated deficit
      		           -393,457,000           
        trade accounts receivable, net of allowance for doubtful accounts of 293 and 0 as of december 31, 2020 and 2019
      		            145,670,000          
        property, plant, and equipment, net of accumulated depreciation and amortization of 382,423 and 256,378 as of december 31, 2020 and 2019
      		            363,620,000          
        owned and leased mineral rights, net of accumulated depletion and amortization of 35,143 and 27,548 as of december 31, 2020 and 2019
      		            463,250,000          
        other acquired intangibles, net of accumulated amortization of 25,700 and 26,806 as of december 31, 2020 and 2019
      		            88,196,000          
        acquisition-related obligations - current
      		            19,099,000   33,211,000 33,639,000 33,165,000 33,060,000 26,122,000 27,334,000 13,670,000 
        common stock - par value 0.01, 50.0 million shares authorized, 20.6 million issued and 18.3 million outstanding at december 31, 2020 and 20.5 million issued and 18.2 million outstanding at december 31, 2019
      		            206,000          
        trade accounts receivable, net of allowance for doubtful accounts of 432 and 0 as of september 30, 2020 and december 31, 2019
      		             179,671,000         
        property, plant, and equipment, net of accumulated depreciation and amortization of 395,397 and 314,276 as of september 30, 2020 and december 31, 2019
      		             401,197,000         
        owned and leased mineral rights, net of accumulated depletion and amortization of 40,623 and 27,877 as of september 30, 2020 and december 31, 2019
      		             489,631,000         
        other acquired intangibles, net of accumulated amortization of 38,806 and 32,686 as of september 30, 2020 and december 31, 2019
      		             100,350,000         
        common stock - par value 0.01, 50.0 million shares authorized, 20.6 million issued and 18.3 million outstanding at september 30, 2020 and 20.5 million issued and 18.2 million outstanding at december 31, 2019
      		             206,000         
        retained (deficit) earnings
      		             -260,376,000         
        trade accounts receivable, net of allowance for doubtful accounts of 793 and 0 as of june 30, 2020 and december 31, 2019
      		              183,820,000        
        property, plant, and equipment, net of accumulated depreciation and amortization of 351,561 and 314,276 as of june 30, 2020 and december 31, 2019
      		              423,367,000        
        owned and leased mineral rights, net of accumulated depletion and amortization of 34,961 and 27,877 as of june 30, 2020 and december 31, 2019
      		              495,303,000        
        other acquired intangibles, net of accumulated amortization of 35,717 and 32,686 as of june 30, 2020 and december 31, 2019
      		              103,439,000        
        common stock - par value 0.01, 50.0 million shares authorized, 20.6 million issued and 18.3 million outstanding at june 30, 2020 and 20.5 million issued and 18.2 million outstanding at december 31, 2019
      		              206,000        
        trade accounts receivable, net of allowance for doubtful accounts of 1,213 and 0 as of march 31, 2020 and december 31, 2019
      		               245,377,000       
        property, plant, and equipment, net of accumulated depreciation and amortization of 349,444 and 314,276 as of march 31, 2020 and december 31, 2019
      		               561,836,000       
        owned and leased mineral rights, net of accumulated depletion and amortization of 33,590 and 27,877 as of march 31, 2020 and december 31, 2019
      		               501,061,000       
        other acquired intangibles, net of accumulated amortization of 34,631 and 32,686 as of march 31, 2020 and december 31, 2019
      		               115,628,000       
        common stock - par value 0.01, 50.0 million shares authorized, 20.5 million issued and 18.3 million outstanding at march 31, 2020 and 20.5 million issued and 18.2 million outstanding at december 31, 2019
      		               205,000       
        trade accounts receivable, net of allowance for doubtful accounts of 0 as of december 31, 2019 and 2018
      		                244,666,000      
        property, plant, and equipment, net of accumulated depreciation and amortization of 314,276 and 106,766 as of december 31, 2019 and 2018
      		                583,262,000      
        owned and leased mineral rights, net of accumulated depletion and amortization of 27,877 and 11,390 as of december 31, 2019 and 2018
      		                523,141,000      
        goodwill
      		                 124,353,000 101,019,000 107,534,000 95,624,000  
        other acquired intangibles, net of accumulated amortization of 32,686 and 20,267 as of december 31, 2019 and 2018
      		                125,145,000      
        preferred stock - par value 0.01, 5.0 million shares authorized at december 31, 2019 and 2018, none issued
      		                      
        common stock - par value 0.01, 50.0 million shares authorized, 20.5 million issued and 18.2 million outstanding at december 31, 2019 and 20.2 million issued and 19.1 million outstanding at december 31, 2018
      		                205,000      
        trade accounts receivable, net of allowance for doubtful accounts of 0 as of september 30, 2019 and december 31, 2018
      		                 259,931,000     
        property, plant, and equipment, net of accumulated depreciation and amortization of 274,704 and 106,766 as of september 30, 2019 and december 31, 2018
      		                 614,624,000     
        owned and leased mineral rights, net of accumulated depletion and amortization of 23,877 and 11,390 as of september 30, 2019 and december 31, 2018
      		                 572,620,000     
        other acquired intangibles, net of accumulated amortization of 39,820 and 20,267 as of september 30, 2019 and december 31, 2018
      		                 138,725,000     
        common stock - par value 0.01, 50.0 million shares authorized, 20.5 million issued and 18.2 million outstanding at september 30, 2019 and 20.2 million issued and 19.1 million outstanding at december 31, 2018
      		                 205,000     
        trade accounts receivable, net of allowance for doubtful accounts of 0 as of june 30, 2019 and december 31, 2018
      		                  280,025,000    
        property, plant, and equipment, net of accumulated depreciation and amortization of 220,260 and 106,766 as of june 30, 2019 and december 31, 2018
      		                  630,654,000    
        owned and leased mineral rights, net of accumulated depletion and amortization of 18,769 and 11,390 as of june 30, 2019 and december 31, 2018
      		                  569,394,000    
        other acquired intangibles, net of accumulated amortization of 32,634 and 20,267 as of june 30, 2019 and december 31, 2018
      		                  146,554,000    
        common stock - par value 0.01, 50.0 million shares authorized, 20.4 million issued and 19.2 million outstanding at june 30, 2019 and 20.2 million issued and 19.1 million outstanding at december 31, 2018
      		                  204,000    
        trade accounts receivable, net of allowance for doubtful accounts of 0 as of march 31, 2019 and december 31, 2018
      		                   319,687,000   
        property, plant, and equipment, net of accumulated depreciation and amortization of 163,603 and 106,766 as of march 31, 2019 and december 31, 2018
      		                   678,549,000   
        operating lease right-of-use assets
      		                   13,025,000   
        owned and leased mineral rights, net of accumulated depletion and amortization of 15,698 and 11,390 as of march 31, 2019 and december 31, 2018
      		                   532,476,000   
        other acquired intangibles, net of accumulated amortization of 26,917 and 20,267 as of march 31, 2019 and december 31, 2018
      		                   147,886,000   
        operating lease liabilities - current
      		                   3,447,000   
        operating lease liabilities - long-term
      		                   9,578,000   
        trade accounts receivable, net of allowance for doubtful accounts of 0 as of december 31, 2018 and december 31, 2017
      		                    292,617,000  
        property, plant, and equipment, net of accumulated depreciation and amortization of 106,766 and 39,943 as of december 31, 2018 and december 31, 2017
      		                    699,990,000  
        owned and leased mineral rights, net of accumulated depletion and amortization of 11,390 and 6,512 as of december 31, 2018 and december 31, 2017
      		                    528,232,000  
        other acquired intangibles, net of accumulated amortization of 20,267 and 28,662 as of december 31, 2018 and december 31, 2017
      		                    154,584,000  
        liabilities held for sale
      		                    1,351,000 1,345,000 
        preferred stock - par value 0.01, 5.0 million shares authorized at december 31, 2018 and 2.0 million shares authorized at december 31, 2017, none issued
      		                      
        trade accounts receivable, net of allowance for doubtful accounts of 0 as of september 30, 2018 and december 31, 2017
      		                     138,697,000 
        assets held for sale
      		                      
        property, plant, and equipment
      		                     218,347,000 
        other acquired intangibles, net of accumulated amortization of 20,760 and 28,662 as of september 30, 2018 and december 31, 2017
      		                     5,990,000 
        long-term deposits
      		                     9,237,000 
        preferred stock - par value 0.01, 2.0 million shares authorized, none issued
      		                      
        common stock - par value 0.01, 20.0 million shares authorized, 10.8 million issued and 9.9 million outstanding at september 30, 2018 and 10.7 million issued and 9.9 million outstanding at december 31, 2017
      		                     108,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2024-03-31 2023-09-30 2023-06-30 2023-03-31 2022-09-30 2022-06-30 2022-03-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 
                            
          operating activities:
        		                    
          net loss
        		-11,032,000         -18,991,000 -32,928,000 -100,153,000 -68,637,000        
          adjustments to reconcile net loss to net cash from operating activities:
        		                    
          depreciation, depletion and amortization
        		39,926,000 40,701,000 32,582,000 32,226,000 29,423,000 27,925,000 27,730,000 28,035,000 24,519,000 27,304,000 28,438,000 -3,011,000 50,739,000 49,262,000 54,465,000 -15,678,000 60,843,000 208,726,000 61,271,000 43,598,000 
          amortization of acquired intangibles
        		876,000 1,675,000 2,069,000 2,192,000 2,197,000 4,543,000 5,747,000 5,748,000 2,980,000 2,553,000 3,869,000 4,895,000 2,219,000 2,096,000 865,000 4,624,000 2,314,000 -343,000 -6,683,000 -17,860,000 
          gain on disposal of assets
        		-2,053,000  -511,000 -3,215,000 -2,363,000 -435,000 -1,536,000 -636,000 -464,000 -3,620,000 -1,258,000    -745,000      
          accretion on asset retirement obligations
        		5,215,000 6,143,000 6,376,000 6,376,000 6,377,000 5,921,000 5,947,000 5,954,000 6,674,000 6,648,000 6,648,000 6,852,000 9,127,000 7,304,000 7,375,000 8,853,000 11,827,000 6,847,000 6,232,000  
          employee benefit plans
        		6,266,000 3,833,000 3,526,000 3,202,000 3,261,000 1,080,000 406,000 -174,000 941,000 3,597,000 2,147,000 -696,000 4,530,000 5,259,000 5,346,000 6,333,000 4,949,000 5,638,000 3,926,000 2,680,000 
          deferred tax benefit
        		-5,329,000                    
          stock-based compensation
        		3,736,000 2,769,000 2,999,000 3,645,000 3,034,000 1,520,000 1,401,000 1,182,000 1,189,000 979,000 2,183,000 696,000 1,079,000 1,043,000 2,078,000 4,885,000 2,738,000 -545,000 5,319,000 3,882,000 
          equity loss in affiliates
        		5,733,000 1,640,000 6,660,000 3,174,000 1,748,000 4,821,000 2,136,000 1,361,000 643,000 384,000 134,000  1,295,000 1,047,000 743,000  1,845,000 2,475,000 484,000  
          other
        		2,476,000 -197,000 -57,000 -192,000 126,000 -135,000 432,000 135,000 -4,161,000 -1,046,000 826,000 -616,000 -5,448,000 -716,000 808,000 -5,555,000 -54,000 430,000 -25,000 623,000 
          changes in operating assets and liabilities
        		-16,768,000 9,011,000 6,759,000 76,922,000 -152,153,000 202,563,000 -166,081,000 -124,196,000 -34,385,000 -30,826,000 -35,470,000  -10,912,000 64,956,000 -87,610,000  -9,534,000 -35,265,000 -54,821,000  
          net cash from operating activities
        		29,046,000 196,074,000 157,200,000 317,219,000 177,387,000 496,981,000 465,931,000 336,125,000 96,024,000 -6,336,000 -19,115,000 56,203,000 -5,905,000 78,998,000 -60,000 -5,698,000 20,445,000 102,522,000 14,611,000 -17,935,000 
          investing activities:
        		                    
          capital expenditures
        		-40,668,000 -63,618,000 -54,725,000 -54,863,000 -74,248,000 -33,339,000 -41,866,000 -28,146,000 -22,347,000 -17,644,000 -20,395,000 -35,094,000 -27,806,000 -41,531,000 -49,559,000 -48,228,000 -60,301,000 -42,798,000 -41,084,000 -25,159,000 
          free cash flows
        		-11,622,000 132,456,000 102,475,000 262,356,000 103,139,000 463,642,000 424,065,000 307,979,000 73,677,000 -23,980,000 -39,510,000 21,109,000 -33,711,000 37,467,000 -49,619,000 -53,926,000 -39,856,000 59,724,000 -26,473,000 -43,094,000 
          capital contributions to equity affiliates
        		-13,403,000 -8,476,000 -6,901,000 -6,819,000 -8,124,000 -5,307,000 -5,057,000 -3,468,000 -2,578,000 -1,454,000 -441,000 -247,000 -780,000 -1,501,000 -915,000 -2,451,000 -2,793,000 -1,271,000 -3,536,000 -1,494,000 
          purchases of investment securities
        		-27,826,000 -7,230,000 -7,680,000 -17,085,000 -141,750,000 -53,708,000 -127,781,000 -50,000 -4,000 -2,511,000 -12,959,000  -11,000 -6,172,000 -12,435,000      
          sales and maturities of investment securities
        		28,240,000 10,172,000 12,948,000 31,990,000 204,660,000                
          net cash from investing activities
        		-53,595,000 -68,859,000 -55,336,000 -43,410,000 -27,891,000 -35,415,000 -143,597,000 -3,552,000 -21,500,000 -11,053,000 -29,749,000 -85,136,000 -24,705,000 -41,357,000 -58,771,000 -24,173,000 -91,448,000 -30,808,000 -45,323,000 173,735,000 
          financing activities:
        		                    
          principal repayments of long-term debt
        		-915,000 -632,000 -636,000 -612,000 -438,000 -122,000 -249,901,000 -200,461,000             
          common stock repurchases and related expenses
        		-22,901,000 -116,089,000 -102,184,000 -156,282,000 -144,919,000 -196,216,000 -173,106,000 -21,844,000 -106,000 0 -680,000 -38,000 -16,000 -47,000 -108,000 -2,137,000 -30,611,000 -703,000 -4,171,000 -15,431,000 
          net cash from financing activities
        		-23,888,000 -120,027,000 -106,500,000 -163,548,000 -231,452,000 -203,112,000 -421,321,000 -219,700,000 -73,487,000 -3,025,000 -6,404,000 -19,099,000 -28,875,000 -29,538,000 55,136,000 -5,584,000 -46,336,000 -5,988,000 -11,786,000 37,582,000 
          net decrease in cash and cash equivalents and restricted cash
        		-48,437,000          -55,268,000 -48,032,000   -3,695,000    -42,498,000  
          cash and cash equivalents and restricted cash at beginning of period
        		492,885,000 384,125,000 0 0 355,394,000 0 0 182,614,000 0 0 244,571,000 0 0 0 347,680,000 0 0 0 477,246,000 0 
          cash and cash equivalents and restricted cash at end of period
        		444,448,000 391,313,000 -4,636,000 110,261,000 273,438,000 258,454,000 -98,987,000 295,487,000 1,037,000 -20,414,000 189,303,000 -48,032,000 -59,485,000 8,103,000 343,985,000 -35,455,000 -117,339,000 65,726,000 434,748,000 193,382,000 
          supplemental disclosure of noncash investing and financing activities:
        		                    
          accrued capital expenditures
        		11,089,000 14,525,000 -2,330,000 245,000 13,703,000                
          net income
        		 126,995,000 93,814,000 181,355,000 270,771,000 252,817,000 574,157,000 400,891,000       -39,808,000 -140,941,000 -68,532,000 -113,661,000 6,815,000 156,542,000 
          adjustments to reconcile net income to net cash from operating activities:
        		                    
          amortization of debt issuance costs and accretion of debt discount
        		 280,000 525,000 526,000 534,000 526,000 3,552,000 3,679,000 2,871,000 3,164,000 3,316,000 3,685,000 3,698,000 3,730,000 3,659,000 3,624,000 3,722,000 3,462,000 3,262,000 2,219,000 
          loss on disposal of assets
        		 1,610,000          -222,000 -1,424,000   6,680,000 90,000    
          deferred income taxes
        		 1,614,000 2,458,000 11,008,000 14,432,000 -1,211,000 7,941,000 4,676,000 -4,000 9,000 -6,000 112,000 -21,000 72,000 32,960,000 9,923,000 11,602,000 -28,026,000 -5,597,000  
          proceeds from disposal of assets
        		  1,016,000                  
          debt issuance costs
        		        -93,000       -585,000 -265,000   -14,465,000 
          dividend equivalents paid
        		                    
          net increase in cash and cash equivalents and restricted cash
        		 7,188,000 -4,636,000 110,261,000 -81,956,000 258,454,000 -98,987,000 112,873,000        -35,455,000 -117,339,000   193,382,000 
          accrued stock repurchase excise tax
        		                    
          proceeds on disposal of assets
        		 287,000   3,478,000 499,000 1,594,000 917,000 670,000 4,149,000 2,652,000 892,000 1,846,000 1,077,000 208,000 1,610,000 122,000   350,000 
          cash paid for business acquired
        		  0 0 -11,919,000                
          dividend and dividend equivalents paid
        		 -3,000,000 -7,082,000 -6,670,000 -85,979,000                
          financing leases and capital financing - equipment
        		  65,000 241,000 1,753,000                
          accrued common stock repurchases and stock repurchase excise tax
        		 4,665,000                   
          accrued dividend payable
        		 525,000 -123,000                  
          mark-to-market adjustment for acquisition-related obligations
        		     -2,954,000 4,208,000 9,361,000 11,676,000 3,157,000 3,176,000 4,675,000 3,624,000 -2,052,000 -14,997,000 -3,276,000 -3,238,000 1,014,000 1,936,000  
          proceeds from exercise of warrants
        		  3,763,000 337,000 222,000 285,000 2,229,000 2,257,000             
          accrued common stock repurchases
        		  -367,000 647,000 5,995,000                
          dividends declared
        		    6,825,000                
          maturity of investment securities
        		     56,435,000 32,507,000 28,438,000 2,742,000 6,390,000 1,376,000 4,007,000 2,025,000 6,735,000 3,918,000 49,475,000     
          repurchases of long-term debt
        		                    
          principal repayments of financing lease obligations
        		      -555,000 -543,000 -525,000 -501,000 -501,000 -885,000 -677,000 -811,000 -803,000 -694,000 -860,000 -1,465,000 -635,000  
          proceeds from exercise of stock options
        		      12,000 891,000             
          accretion of acquisition-related obligations discount
        		       109,000 281,000 352,000 371,000 460,000 655,000 1,135,000 1,092,000 1,155,000 1,147,000 1,645,000 1,575,000 1,462,000 
          asset impairment and restructuring
        		        0 0 -561,000 35,065,000 3,571,000        
          proceeds from borrowings on long-term debt
        		                    
          proceeds from borrowings on debt
        		           0 0 0 57,500,000 0 0    
          principal repayments of debt
        		         -1,404,000 -4,755,000 -16,404,000 -13,805,000 -28,155,000 -1,404,000 -1,404,000 -1,405,000 -543,125,000 -6,875,000 -465,381,000 
          principal repayments of notes payable
        		         -894,000 -468,000 -1,772,000 -14,377,000 -525,000 -49,000 -764,000 -13,233,000   -750,000 
          loss on sale of business
        		                    
          gain on assets acquired in an exchange transaction
        		               0 0 0 -9,083,000  
          goodwill impairment
        		                    
          loss on modification and extinguishment of debt
        		               0 0    
          equity in loss of affiliates
        		                   3,255,000 
          trade accounts receivable
        		                    
          inventories
        		                    
          prepaid expenses and other current assets
        		                    
          deposits
        		                    
          other non-current assets
        		                    
          trade accounts payable
        		                    
          accrued expenses and other current liabilities
        		                    
          acquisition-related obligations
        		                    
          asset retirement obligations
        		                    
          other non-current liabilities
        		                    
          cash paid on sale of business
        		                    
          purchase of investment securities
        		                    
          supplemental cash flow information:
        		                    
          cash paid for interest
        		                    
          cash paid for income taxes
        		                    
          cash received for income tax refunds
        		                    
          asset impairment
        		              33,709,000 60,465,000 726,000    
          gain on settlement of acquisition-related obligations
        		                   -170,000 
          bargain purchase gain
        		                    
          loss on sale of powder river basin
        		                    
          payments on disposal of assets
        		                   0 
          cash, cash equivalents and restricted cash acquired in acquisition, net of amounts paid
        		                    
          purchase of additional ownership interest in equity affiliate
        		                    
          cash paid on sale of powder river basin
        		                    
          form s-4 costs
        		                    
          debt extinguishment costs
        		                    
          debt amendment costs
        		                    
          special dividend paid
        		                    
          issuance of equity in connection with acquisition
        		                    
          net balance due to alpha deemed effectively settled
        		                    
          purchases of investment securities - held to maturity
        		                 -5,591,000 -4,308,000  
          maturity of investment securities - held to maturity
        		                 18,114,000 3,202,000  
          non-cash reorganization items
        		                    
          mark-to-market adjustment for warrant derivative liability
        		                    
          purchase of investment securities - held to maturity
        		                    
          principal repayments of capital lease obligations
        		                   -312,000 
          transfers to alpha
        		                    
          cash paid for taxes
        		                    
          supplemental disclosure of non-cash investing and financing activities:
        		                    
          capital leases and capital financing - equipment
        		                    
          issuance of 10% senior secured first lien notes in connection with acquisition
        		                    
          issuance of guc distribution note in connection with acquisition
        		                    
          issuance of warrants in connection with acquisition
        		                    
          accretion of asset retirement obligations
        		                    
          loss on early extinguishment of debt