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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2021
Segment Reporting [Abstract]  
Reconciliation of Revenue from Segments to Consolidated
The following tables include reconciliations of segment information to consolidated amounts (in thousands):
 For the three months ended
June 30,		For the six months ended
June 30,
2021202020212020
Revenues
Mining$224,759 $159,043 $431,748 $380,381 
All other2,681 4,658 9,456 10,040 
Total revenues$227,440 $163,701 $441,204 $390,421 
Reconciliation of Capital Expenditures from Segments to Consolidated
 For the three months ended
June 30,		For the six months ended
June 30,
2021202020212020
Capital Expenditures
Mining$13,873 $23,190 $22,492 $45,027 
All other299 2,789 1,159 3,727 
Total capital expenditures$14,172 $25,979 $23,651 $48,754 
Reconciliation of Net Income (Loss) from Segments to Consolidated Below is a reconciliation of Segment Adjusted EBITDA to net (loss) income, which is its most directly comparable financial measure calculated and presented in accordance with GAAP (in thousands): 
 For the three months ended
June 30,		For the six months ended
June 30,
2021202020212020
Segment Adjusted EBITDA$71,994 $28,266 $124,633 $98,090 
Other revenues2,681 4,658 9,456 10,040 
Cost of other revenues(8,343)(7,642)(16,138)(15,203)
Depreciation and depletion(40,151)(22,156)(73,054)(50,848)
Selling, general and administrative(11,115)(8,457)(18,752)(16,913)
Business interruption (7,020)— (7,020)— 
Idle mine (10,876)— (10,876)— 
Other income (expense)— — (109)1,822 
Interest expense, net(8,477)(8,255)(17,170)(15,788)
Income tax benefit (expense)6,626 4,425 (17,006)1,184 
Net (loss) income$(4,681)$(9,161)$(26,036)$12,384