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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues    
Oil, natural gas and NGL $ 86,966 $ 98,149
Other 162 201
Total revenues 87,128 98,350
Expenses    
Production 24,713 25,023
Production taxes 4,700 3,176
Depreciation and depletion—oil and natural gas 27,997 26,980
Depreciation and amortization—other 3,153 3,837
Impairment 4,170 2,531
General and administrative 14,022 19,538
Shareholder activism costs 407 0
Employee termination benefits 31,587 400
Loss (gain) on derivative contracts 18,330 (34,183)
Other operating expense 16 268
Total expenses 129,095 47,570
(Loss) income from operations (41,967) 50,780
Other (expense) income    
Interest expense, net (948) (939)
Gain on extinguishment of debt 1,151 0
Other income, net 873 970
Total other income 1,076 31
(Loss) income before income taxes (40,891) 50,811
Income tax expense 3 3
Net (loss) income $ (40,894) $ 50,808
(Loss) earnings per share    
Basic (in dollars per share) $ (1.18) $ 1.90
Diluted (in dollars per share) $ (1.18) $ 1.90
Weighted average number of common shares outstanding    
Basic (in shares) 34,575 26,801
Diluted (in shares) 34,575 26,801