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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Oil, natural gas and natural gas liquids sales:        
Other $ 108 $ 190 $ 263 $ 1,023
Total operating revenues 55,415 120,137 104,670 255,735
Production:        
Lease operating 5,314 20,380 10,229 41,024
Workover and other 1,956 7,128 3,317 18,569
Taxes other than income 3,226 10,727 6,255 22,303
Gathering and other 5,956 11,812 12,378 23,754
Restructuring 27 50 128 805
General and administrative 14,255 26,922 29,465 47,771
Depletion, depreciation and accretion 16,096 31,962 32,087 64,848
(Gain) loss on sale of oil and natural gas properties 2,225 (4,500) 5,904 (235,690)
Total operating expenses 49,055 104,481 99,763 (16,616)
Income (loss) from operations 6,360 15,656 4,907 272,351
Other income (expenses):        
Net gain (loss) on derivative contracts (12,100) 24,156 (6,197) 50,554
Interest expense and other (10,534) (19,635) (17,582) (44,478)
Gain (loss) on extinguishment of debt       (56,898)
Total other income (expenses) (22,634) 4,521 (23,779) (50,822)
Income (loss) before income taxes (16,274) 20,177 (18,872) 221,529
Income tax benefit (provision)       (12,000)
Net income (loss) (16,274) 20,177 (18,872) 209,529
Non-cash preferred dividend   (47,206)   (48,007)
Net income (loss) available to common stockholders $ (16,274) $ (27,029) $ (18,872) $ 161,522
Net income (loss) per share of common stock:        
Basic (in dollars per share) $ (0.10) $ (0.19) $ (0.12) $ 1.37
Diluted (in dollars per share) $ (0.10) $ (0.19) $ (0.12) $ 1.37
Weighted average common shares outstanding:        
Basic (in shares) 157,943 143,545 155,925 117,554
Diluted (in shares) 157,943 143,545 155,925 118,209
Total oil, natural gas and natural gas liquids sales        
Oil, natural gas and natural gas liquids sales:        
Total operating revenues $ 55,307 $ 119,947 $ 104,407 $ 254,712
Oil        
Oil, natural gas and natural gas liquids sales:        
Total operating revenues 48,756 108,695 91,825 231,216
Natural gas        
Oil, natural gas and natural gas liquids sales:        
Total operating revenues 1,560 5,946 3,879 12,165
Natural gas liquids        
Oil, natural gas and natural gas liquids sales:        
Total operating revenues $ 4,991 $ 5,306 $ 8,703 $ 11,331