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Selected Quarterly Financial Data - Schedule Of Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 175,711 $ 135,137 $ 88,874 $ 187,764 $ 233,240 $ 228,857 $ 286,810 $ 178,713 $ 587,486 $ 927,620 $ 891,288
Write-down of oil and natural gas properties 267,859     57         267,916 12,221  
Operating income (expense) (285,436) (37,059) (94,603) (4,212) 46,970 52,883 94,872 18,369 (421,310) 213,094 253,129
Price risk management activities income (expense) (66,968) (19,882) (68,682) 243,217 (59,508) 43,760 29,990 (109,579) 87,685 (95,337) 60,435
Net income (loss) $ (430,743) $ (52,000) $ (140,611) $ 157,749 $ 304 $ 73,297 $ 94,764 $ (109,636) $ (465,605) $ 58,729 $ 221,540
Net income (loss) per common share:                      
Basic $ (5.73) $ (0.73) $ (2.14) $ 2.71 $ 0.01 $ 1.35 $ 1.75 $ (2.02) $ (6.88) $ 1.08 $ 4.81
Diluted $ (5.73) $ (0.73) $ (2.14) $ 2.69 $ 0.01 $ 1.35 $ 1.74 $ (2.02) $ (6.88) $ 1.08 $ 4.81
Weighted average common shares outstanding:                      
Basic 75,199 71,286 65,807 58,240 54,203 54,200 54,178 54,156 67,664 54,185 46,058
Diluted 75,199 71,286 65,807 58,572 54,559 54,430 54,451 54,156 67,664 54,413 46,061