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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)

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