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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Total revenues $ 271,059 $ 482,743 $ 825,209 $ 1,587,880  
Operating income (loss) 38,524 8,441 (4,835,228) 130,457  
Other income (expense), net (90,765) 4,498 102,012 (165,785)  
Income (loss) before income taxes (52,241) 12,939 (4,733,216) (35,328)  
General and administrative expenses 49,251 32,860 117,868 98,245  
Equity-based compensation expenses 4,834 8,446 16,531 26,370  
Property, plant and equipment, net 2,115,854   2,115,854   $ 6,977,776
Total assets 2,506,777   2,506,777   7,499,253
Exploration And Production          
Segment Reporting Information [Line Items]          
Total revenues 215,636 432,720 668,849 1,438,235  
Midstream Services          
Segment Reporting Information [Line Items]          
Total revenues 110,061 123,411 316,737 349,438  
Operating Segments | Exploration And Production          
Segment Reporting Information [Line Items]          
Total revenues 215,636 432,720 668,849 1,438,235  
Operating income (loss) (8,603) (52,529) (4,866,759) (30,734)  
Other income (expense), net (87,953) 9,010 140,580 (153,325)  
Income (loss) before income taxes (96,556) (43,519) (4,726,179) (184,059)  
General and administrative expenses 44,088 29,409 103,051 86,800  
Equity-based compensation expenses 4,502 8,247 15,909 25,683  
Property, plant and equipment, net 1,197,626   1,197,626   5,939,389
Total assets 1,499,941   1,499,941   6,418,610
Operating Segments | Midstream Services          
Segment Reporting Information [Line Items]          
Total revenues 55,423 50,023 156,360 149,645  
Operating income (loss) 48,132 64,299 36,526 169,321  
Other income (expense), net (2,812) (4,512) (38,568) (12,460)  
Income (loss) before income taxes 45,320 59,787 (2,042) 156,861  
General and administrative expenses 9,089 7,842 26,995 24,683  
Equity-based compensation expenses 400 383 1,031 1,363  
Property, plant and equipment, net 962,209   962,209   1,078,903
Total assets 1,050,817   1,050,817   1,121,159
Inter-segment | Exploration And Production          
Segment Reporting Information [Line Items]          
Total revenues 0 0 0 0  
Inter-segment | Midstream Services          
Segment Reporting Information [Line Items]          
Total revenues 54,638 73,388 160,377 199,793  
Eliminations          
Segment Reporting Information [Line Items]          
Total revenues (54,638) (73,388) (160,377) (199,793)  
Operating income (loss) (1,005) (3,329) (4,995) (8,130)  
Other income (expense), net 0 0 0 0  
Income (loss) before income taxes (1,005) (3,329) (4,995) (8,130)  
General and administrative expenses (3,926) (4,391) (12,178) (13,238)  
Equity-based compensation expenses (68) $ (184) (409) $ (676)  
Property, plant and equipment, net (43,981)   (43,981)   (40,516)
Total assets $ (43,981)   $ (43,981)   $ (40,516)