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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | $ 501,337 | $ 254,091 | $ 922,553 | $ 539,207 |
Total revenues | 501,337 | 254,091 | 922,553 | 539,207 |
Operating income (loss) | (242,674) | 5,379 | (129,689) | 25,471 |
Other income | (174,628) | 13,528 | (283,073) | 33,298 |
Income (loss) before income taxes | (417,302) | 18,907 | (412,762) | 58,769 |
Property, plant and equipment, net | 6,757,241 |  | 6,757,241 |  | $ 6,173,486
Total assets | 7,465,335 |  | 7,465,335 |  | 6,615,130
Exploration and Production [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 450,124 | 226,724 | 831,832 | 491,607 |
Total revenues | 450,124 | 226,724 | 831,832 | 491,607 |
Midstream Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 32,717 | 15,566 | 60,639 | 30,172 |
Total revenues | 72,427 | 40,312 | 136,989 | 77,953 |
Well Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 18,496 | 11,801 | 30,082 | 17,428 |
Total revenues | 59,914 | 33,451 | 104,803 | 54,431 |
Operating Segments [Member] | Exploration and Production [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 450,124 | 226,724 | 831,832 | 491,607 |
Operating income (loss) | (280,090) | (17,425) | (200,130) | (16,456) |
Other income | (174,572) | 13,525 | (282,717) | 33,292 |
Income (loss) before income taxes | (454,662) | (3,900) | (482,847) | 16,836 |
Property, plant and equipment, net | 6,129,083 |  | 6,129,083 |  | 5,663,323
Total assets | 6,767,902 |  | 6,767,902 |  | 6,050,255
Operating Segments [Member] | Midstream Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 32,717 | 15,566 | 60,639 | 30,172 |
Operating income (loss) | 37,894 | 23,103 | 70,132 | 43,865 |
Other income | (79) | 3 | (336) | 2 |
Income (loss) before income taxes | 37,815 | 23,106 | 69,796 | 43,867 |
Property, plant and equipment, net | 786,246 |  | 786,246 |  | 649,923
Total assets | 816,422 |  | 816,422 |  | 663,614
Operating Segments [Member] | Well Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 18,496 | 11,801 | 30,082 | 17,428 |
Operating income (loss) | 8,028 | 1,950 | 16,178 | (1,641) |
Other income | 23 | 0 | (20) | 4 |
Income (loss) before income taxes | 8,051 | 1,950 | 16,158 | (1,637) |
Property, plant and equipment, net | 44,319 |  | 44,319 |  | 46,779
Total assets | 48,419 |  | 48,419 |  | 52,800
Segment Reconciling Items [Member] | Exploration and Production [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Segment Reconciling Items [Member] | Midstream Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 39,710 | 24,746 | 76,350 | 47,781 |
Segment Reconciling Items [Member] | Well Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 41,418 | 21,650 | 74,721 | 37,003 |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | (81,128) | (46,396) | (151,071) | (84,784) |
Operating income (loss) | (8,506) | (2,249) | (15,869) | (297) |
Other income | 0 | 0 | 0 | 0 |
Income (loss) before income taxes | (8,506) | $ (2,249) | (15,869) | $ (297) |
Property, plant and equipment, net | (202,407) |  | (202,407) |  | (186,539)
Total assets | $ (167,408) |  | $ (167,408) |  | $ (151,539)

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