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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]          
Total revenues $ 482,743 $ 674,629 $ 1,587,880 $ 1,722,192  
Operating income (loss) 8,441 179,045 130,457 49,356  
Other income (expense), net 4,498 (88,040) (165,785) (371,113)  
Income (loss) before income taxes 12,939 91,005 (35,328) (321,757)  
General and administrative 52,860 34,859 118,245 91,029  
Equity-based compensation 8,446 7,456 26,370 21,586  
Property, plant and equipment, net 7,089,610   7,089,610   $ 7,027,109
Total assets 7,666,977   7,666,977   7,626,142
Exploration and Production Revenues          
Segment Reporting Information [Line Items]          
Total revenues 423,822 625,342 1,407,440 1,585,204  
Midstream Services          
Segment Reporting Information [Line Items]          
Total revenues 123,411 75,770 349,438 209,739  
Well Services          
Segment Reporting Information [Line Items]          
Total revenues 30,409 56,439 102,321 161,242  
Operating Segments | Exploration and Production Revenues          
Segment Reporting Information [Line Items]          
Total revenues 423,822 625,342 1,407,440 1,585,204  
Operating income (loss) (51,476) 146,969 (30,657) (53,159)  
Other income (expense), net 8,871 (87,594) (153,481) (370,311)  
Income (loss) before income taxes (42,605) 59,375 (184,138) (423,470)  
General and administrative 46,377 30,454 99,665 77,425  
Equity-based compensation 8,246 7,102 25,348 20,565  
Property, plant and equipment, net 6,236,331   6,236,331   6,311,566
Total assets 6,736,948   6,736,948   6,838,987
Operating Segments | Midstream Services          
Segment Reporting Information [Line Items]          
Total revenues 50,023 33,025 149,645 90,644  
Operating income (loss) 64,299 31,326 169,321 101,457  
Other income (expense), net (4,512) (367) (12,460) (703)  
Income (loss) before income taxes 59,787 30,959 156,861 100,754  
General and administrative 7,842 5,614 24,683 18,107  
Equity-based compensation 383 442 1,363 1,222  
Property, plant and equipment, net 1,052,558   1,052,558   893,285
Total assets 1,088,728   1,088,728   920,619
Operating Segments | Well Services          
Segment Reporting Information [Line Items]          
Total revenues 8,898 16,262 30,795 46,344  
Operating income (loss) 236 9,237 2,538 25,415  
Other income (expense), net 139 (79) 156 (99)  
Income (loss) before income taxes 375 9,158 2,694 25,316  
General and administrative 6,489 5,437 20,038 17,084  
Equity-based compensation 42 354 1,130 1,149  
Property, plant and equipment, net 27,712   27,712   38,871
Total assets 33,292   33,292   48,150
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 73,388 42,745 199,793 119,095  
Inter-segment | Well Services          
Segment Reporting Information [Line Items]          
Total revenues 21,511 40,177 71,526 114,898  
Eliminations          
Segment Reporting Information [Line Items]          
Total revenues (94,899) (82,922) (271,319) (233,993)  
Operating income (loss) (4,618) (8,487) (10,745) (24,357)  
Other income (expense), net 0 0 0 0  
Income (loss) before income taxes (4,618) (8,487) (10,745) (24,357)  
General and administrative (7,848) (6,646) (26,141) (21,587)  
Equity-based compensation (225) $ (442) (1,471) $ (1,350)  
Property, plant and equipment, net (226,991)   (226,991)   (216,613)
Total assets $ (191,991)   $ (191,991)   $ (181,614)