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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues and other:    
Revenues and other $ 141,661 $ 131,862
Gains (losses) on derivatives (63,124) (34,644)
Other revenues 117 66
Total revenues and other 76,539 97,284
Expenses and other:    
Transportation expenses 2,173 2,978
Marketing expenses 851 580
General and administrative expenses 14,340 11,985
Depreciation, depletion, and amortization 24,585 18,429
Taxes, other than income taxes 8,086 8,256
(Gains) losses on derivatives 63,124 34,644
(Gains) losses on sale of assets and other, net 1,245 0
Total expenses and other 114,853 91,121
Other income (expenses):    
Interest expense (8,805) (7,796)
Other, net 154 27
Total other income (expenses) (8,651) (7,769)
Reorganization items, net (231) 8,955
Income (loss) before income taxes (47,196) 7,349
Income tax expense (benefit) (13,098) 939
Net income (loss) (34,098) 6,410
Series A preferred stock dividends 0 (5,650)
Net income (loss) attributable to common stockholders $ (34,098) $ 760
Net income (loss) per share attributable to common stockholders:    
Basic (in dollars per share) $ (0.42) $ 0.02
Diluted (in dollars per share) $ (0.42) $ 0.02
Oil, natural gas and natural gas liquids sales    
Revenues and other:    
Revenues and other $ 131,102 $ 125,624
Expenses and other:    
Cost of goods sold 57,928 44,303
Electricity sales    
Revenues and other:    
Revenues and other 9,729 5,453
Expenses and other:    
Cost of goods sold 7,760 4,590
Oil    
Revenues and other:    
Gains (losses) on derivatives (65,239) (34,644)
Expenses and other:    
(Gains) losses on derivatives 65,239 34,644
Marketing revenues    
Revenues and other:    
Revenues and other 830 785
Natural gas sales    
Revenues and other:    
Revenues and other 6,715 6,563
Gains (losses) on derivatives 2,115 0
Expenses and other:    
(Gains) losses on derivatives $ (2,115) $ 0