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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]          
Total revenues $ 529,405 $ 573,751 $ 1,105,137 $ 1,047,563  
Operating income 71,572 (242,674) 122,016 (129,689)  
Other income (expense) (8,158) (174,628) (170,283) (283,073)  
Income (loss) before income taxes 63,414 (417,302) (48,267) (412,762)  
General and administrative 30,926 28,230 65,385 56,170  
Equity-based compensation 8,911 7,376 17,924 14,130  
Property, plant and equipment, net 7,169,114   7,169,114   $ 7,027,109
Total assets 7,710,288   7,710,288   7,626,142
Exploration and Production Revenues          
Segment Reporting Information [Line Items]          
Total revenues 466,365 525,557 983,618 959,861  
Midstream Services          
Segment Reporting Information [Line Items]          
Total revenues 119,445 69,408 226,027 133,970  
Well Services          
Segment Reporting Information [Line Items]          
Total revenues 39,281 59,914 71,912 104,803  
Operating Segments | Exploration and Production Revenues          
Segment Reporting Information [Line Items]          
Total revenues 466,365 525,557 983,618 959,861  
Operating income 18,895 (280,090) 20,819 (200,130)  
Other income (expense) (3,970) (174,572) (162,352) (282,717)  
Income (loss) before income taxes 14,925 (454,662) (141,533) (482,847)  
General and administrative 25,761 23,492 53,288 46,971  
Equity-based compensation 8,522 7,012 17,102 13,463  
Property, plant and equipment, net 6,336,438   6,336,438   6,311,566
Total assets 6,804,705   6,804,705   6,838,987
Operating Segments | Midstream Services          
Segment Reporting Information [Line Items]          
Total revenues 51,601 29,698 99,622 57,620  
Operating income 55,216 37,894 105,022 70,132  
Other income (expense) (4,200) (79) (7,948) (336)  
Income (loss) before income taxes 51,016 37,815 97,074 69,796  
General and administrative 7,980 6,079 16,841 12,493  
Equity-based compensation 515 409 980 780  
Property, plant and equipment, net 1,024,625   1,024,625   893,285
Total assets 1,057,033   1,057,033   920,619
Operating Segments | Well Services          
Segment Reporting Information [Line Items]          
Total revenues 11,439 18,496 21,897 30,082  
Operating income 1,487 8,028 2,302 16,178  
Other income (expense) 12 23 17 (20)  
Income (loss) before income taxes 1,499 8,051 2,319 16,158  
General and administrative 6,088 5,756 13,549 11,647  
Equity-based compensation 527 409 1,088 795  
Property, plant and equipment, net 30,792   30,792   38,871
Total assets 36,292   36,292   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 67,844 39,710 126,405 76,350  
Inter-segment | Well Services          
Segment Reporting Information [Line Items]          
Total revenues 27,842 41,418 50,015 74,721  
Eliminations          
Segment Reporting Information [Line Items]          
Total revenues (95,686) (81,128) (176,420) (151,071)  
Operating income (4,026) (8,506) (6,127) (15,869)  
Other income (expense) 0 0 0 0  
Income (loss) before income taxes (4,026) (8,506) (6,127) (15,869)  
General and administrative (8,903) (7,097) (18,293) (14,941)  
Equity-based compensation (653) $ (454) (1,246) $ (908)  
Property, plant and equipment, net (222,741)   (222,741)   (216,613)
Total assets $ (187,742)   $ (187,742)   $ (181,614)