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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenues    
Total revenues $ 114,976 $ 266,845
Expenses    
Lease operating expenses 43,431 90,938
Production, ad valorem, and other taxes 9,634 19,394
Depreciation and depletion—oil and natural gas 50,349 146,874
Depreciation and amortization—other 7,736 11,684
Impairment 256,399 409,574
General and administrative 15,327 32,058
Restructuring expenses 2,733 0
Employee termination benefits 8,433 4,792
Gain on derivative contracts (5,765) (1,094)
Other operating (income) expense 206 (608)
Total expenses 388,483 713,612
Loss from operations (273,507) (446,767)
Other (expense) income    
Interest expense, net (1,998) (2,974)
Other (expense) income, net (2,494) 436
Total other (expense) income (4,492) (2,538)
Loss before income taxes (277,999) (449,305)
Income tax benefit (646) 0
Net loss $ (277,353) $ (449,305)
Loss per share    
Basic (in dollars per share) $ (7.77) $ (12.68)
Diluted (in dollars per share) $ (7.77) $ (12.68)
Weighted average number of common shares outstanding    
Basic (in shares) 35,689 35,427
Diluted (in shares) 35,689 35,427
Oil, natural gas and NGL    
Revenues    
Total revenues $ 114,450 $ 266,104
Other    
Revenues    
Total revenues $ 526 $ 741