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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues and Other:      
Total revenues and other $ 587,486 $ 927,620 $ 891,288
Operating expenses:      
Depreciation, depletion and amortization 364,346 345,931 288,719
Write-down of oil and natural gas properties 267,916 12,221  
Accretion expense 49,741 34,389 35,344
General and administrative expense 79,175 77,209 85,816
Total operating expenses 1,008,796 714,526 638,159
Operating income (expense) (421,310) 213,094 253,129
Interest expense (99,415) (97,847) (90,114)
Price risk management activities income (expense) 87,685 (95,337) 60,435
Other income 3,018 2,678 1,012
Net income (loss) before income taxes (430,022) 22,588 224,462
Income tax benefit (expense) (35,583) 36,141 (2,922)
Net income (loss) $ (465,605) $ 58,729 $ 221,540
Net income (loss) per common share:      
Basic $ (6.88) $ 1.08 $ 4.81
Diluted $ (6.88) $ 1.08 $ 4.81
Weighted average common shares outstanding:      
Basic 67,664 54,185 46,058
Diluted 67,664 54,413 46,061
Oil and Gas Properties      
Operating expenses:      
Lease operating expense $ 246,564 $ 243,427 $ 226,291
Production taxes 1,054 1,349 1,989
Oil      
Revenues and Other:      
Total revenues and other 506,788 833,118 781,815
Natural Gas      
Revenues and Other:      
Total revenues and other 53,714 55,278 73,610
NGL      
Revenues and Other:      
Total revenues and other 15,434 19,668 $ 35,863
Other      
Revenues and Other:      
Total revenues and other $ 11,550 $ 19,556