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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues:    
Natural gas sales $ 59,543 $ 40,940
Oil sales 13,050 12,861
Total oil and gas sales 72,593 53,801
Operating expenses:    
Production taxes 1,840 1,097
Gathering and transportation 4,334 4,128
Lease operating 9,773 9,889
Depreciation, depletion and amortization 27,152 29,905
General and administrative 6,016 6,401
Loss on sale of oil and gas properties 28,600  
Total operating expenses 77,715 51,420
Operating income (loss) (5,122) 2,381
Other income (expenses):    
Gain from derivative financial instruments 2,602 7,860
Other income 66 163
Interest expense (38,850) (32,900)
Total other income (expenses) (36,182) (24,877)
Loss before income taxes (41,304) (22,496)
Provision for income taxes (582) (435)
Net loss $ (41,886) $ (22,931)
Net loss per share – basic and diluted $ (2.78) $ (1.61)
Weighted average shares outstanding – basic and diluted 15,084 14,225