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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Total revenues $ 166,352 $ 529,405 $ 554,150 $ 1,105,137  
Operating income (loss) (11,224) 71,572 (4,873,752) 122,016  
Other expense, net (80,738) (8,158) 192,777 (170,283)  
Income (loss) before income taxes (91,962) 63,414 (4,680,975) (48,267)  
General and administrative expenses 37,443 30,926 68,617 65,385  
Equity-based compensation expenses 4,890 8,911 11,697 17,924  
Property, plant and equipment, net 2,152,190   2,152,190   $ 6,977,776
Total assets 2,625,626   2,625,626   7,499,253
Exploration and Production Revenues          
Segment Reporting Information [Line Items]          
Total revenues 121,826 477,804 453,213 1,005,515  
Midstream Services          
Segment Reporting Information [Line Items]          
Total revenues 81,721 119,445 206,676 226,027  
Operating Segments | Exploration and Production Revenues          
Segment Reporting Information [Line Items]          
Total revenues 121,826 477,804 453,213 1,005,515  
Operating income (loss) (40,901) 19,457 (4,858,156) 21,795  
Other expense, net (75,465) (3,958) 228,533 (162,335)  
Income (loss) before income taxes (116,366) 15,499 (4,629,623) (140,540)  
General and administrative expenses 32,290 27,572 58,963 57,391  
Equity-based compensation expenses 4,811 8,681 11,407 17,436  
Property, plant and equipment, net 1,219,119   1,219,119   5,939,389
Total assets 1,610,466   1,610,466   6,418,610
Operating Segments | Midstream Services          
Segment Reporting Information [Line Items]          
Total revenues 44,526 51,601 100,937 99,622  
Operating income (loss) 30,620 55,216 (11,606) 105,022  
Other expense, net (5,273) (4,200) (35,756) (7,948)  
Income (loss) before income taxes 25,347 51,016 (47,362) 97,074  
General and administrative expenses 9,304 7,980 17,906 16,841  
Equity-based compensation expenses 203 515 631 980  
Property, plant and equipment, net 976,463   976,463   1,078,903
Total assets 1,058,552   1,058,552   1,121,159
Inter-segment | Exploration and Production Revenues          
Segment Reporting Information [Line Items]          
Total revenues 0 0 0 0  
Inter-segment | Midstream Services          
Segment Reporting Information [Line Items]          
Total revenues 37,195 67,844 105,739 126,405  
Eliminations          
Segment Reporting Information [Line Items]          
Total revenues (37,195) (67,844) (105,739) (126,405)  
Operating income (loss) (943) (3,101) (3,990) (4,801)  
Other expense, net 0 0 0 0  
Income (loss) before income taxes (943) (3,101) (3,990) (4,801)  
General and administrative expenses (4,151) (4,626) (8,252) (8,847)  
Equity-based compensation expenses (124) $ (285) (341) $ (492)  
Property, plant and equipment, net (43,392)   (43,392)   (40,516)
Total assets $ (43,392)   $ (43,392)   $ (40,516)