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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Total revenues $ 575,732 $ 473,812  
Operating income 50,444 112,985  
Other income (expense) (162,125) (108,445)  
Income (loss) before income taxes (111,681) 4,540  
General and administrative 34,459 27,940  
Equity-based compensation 9,013 6,754  
Property, plant and equipment, net 7,056,742   $ 7,027,109
Total assets 7,646,346   7,626,142
Exploration and Production      
Segment Reporting Information [Line Items]      
Total revenues 517,253 434,304  
Midstream Services      
Segment Reporting Information [Line Items]      
Total revenues 106,582 64,562  
Well Services      
Segment Reporting Information [Line Items]      
Total revenues 32,631 44,888  
Operating Segments | Exploration and Production      
Segment Reporting Information [Line Items]      
Total revenues 517,253 434,304  
Operating income 1,924 79,962  
Other income (expense) (158,382) (108,146)  
Income (loss) before income taxes (156,458) (28,184)  
General and administrative 27,527 23,478  
Equity-based compensation 8,580 6,454  
Property, plant and equipment, net 6,292,206   6,311,566
Total assets 6,795,467   6,838,987
Operating Segments | Midstream Services      
Segment Reporting Information [Line Items]      
Total revenues 48,021 27,922  
Operating income 49,806 32,237  
Other income (expense) (3,748) (258)  
Income (loss) before income taxes 46,058 31,979  
General and administrative 8,861 6,414  
Equity-based compensation 465 370  
Property, plant and equipment, net 949,100   893,285
Total assets 1,915,729   920,619
Operating Segments | Well Services      
Segment Reporting Information [Line Items]      
Total revenues 10,458 11,586  
Operating income 815 8,148  
Other income (expense) 5 (41)  
Income (loss) before income taxes 820 8,107  
General and administrative 7,461 5,891  
Equity-based compensation 561 385  
Property, plant and equipment, net 34,150   38,871
Total assets (96,226)   48,150
Inter-segment | Exploration and Production      
Segment Reporting Information [Line Items]      
Total revenues 0 0  
Inter-segment | Midstream Services      
Segment Reporting Information [Line Items]      
Total revenues 58,561 36,640  
Inter-segment | Well Services      
Segment Reporting Information [Line Items]      
Total revenues 22,173 33,302  
Eliminations      
Segment Reporting Information [Line Items]      
Total revenues (80,734) (69,942)  
Operating income (2,101) (7,362)  
Other income (expense) 0 0  
Income (loss) before income taxes (2,101) (7,362)  
General and administrative (9,390) (7,843)  
Equity-based compensation (593) $ (455)  
Property, plant and equipment, net (218,714)   (216,613)
Total assets $ (968,624)   $ (181,614)