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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Revenues $ 888,680 $ 1,204,083
Operating expenses    
Cost of revenues (excluding depreciation) 888,863 1,210,211
Operating expense (excluding depreciation) 74,188 73,391
Depreciation, depletion, and amortization 22,880 21,283
Impairment expense 0 67,922
Gain on sale of assets, net (64,912) 0
General and administrative expense (excluding depreciation) 11,885 11,784
Acquisition and integration costs 438 665
Total operating expenses 933,342 1,385,256
Operating loss (44,662) (181,173)
Other income (expense)    
Interest expense and financing costs, net (18,151) (18,674)
Debt extinguishment and commitment costs (1,507) 0
Gain on curtailment of pension obligation 2,032 0
Other income, net 61 24
Change in value of common stock warrants 0 4,270
Equity losses from Laramie Energy, LLC 0 (45,031)
Total other income (expense), net (17,565) (59,411)
Loss before income taxes (62,227) (240,584)
Income tax benefit 0 18,247
Net Loss $ (62,227) $ (222,337)
Loss per share    
Basic (in dollars per share) $ (1.15) $ (4.18)
Diluted (in dollars per share) $ (1.15) $ (4.18)
Weighted-average number of shares outstanding    
Basic (in shares) 54,280 53,153
Diluted (in shares) 54,280 53,153