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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | $ 546,448 | $ 304,748 | $ 1,469,001 | $ 843,955 |
Operating income | 179,045 | 32,394 | 49,356 | 57,865 |
Other income (expense) | (88,040) | (92,304) | (371,113) | (59,006) |
Income (loss) before income taxes | 91,005 | (59,910) | (321,757) | (1,141) |
Property, plant and equipment, net | 6,900,137 |  | 6,900,137 |  | $ 6,173,486
Total assets | 7,416,431 |  | 7,416,431 |  | 6,615,130
Exploration and Production [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 497,161 | 269,843 | 1,328,994 | 761,450 |
Midstream Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 75,770 | 47,660 | 212,758 | 125,613 |
Well Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 56,439 | 47,163 | 161,242 | 101,594 |
Operating Segments [Member] | Exploration and Production [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 497,161 | 269,843 | 1,328,994 | 761,450 |
Operating income | 146,969 | 3,484 | (53,159) | (12,972) |
Other income (expense) | (87,594) | (92,319) | (370,311) | (59,027) |
Income (loss) before income taxes | 59,375 | (88,835) | (423,470) | (71,999) |
Property, plant and equipment, net | 6,227,767 |  | 6,227,767 |  | 5,663,323
Total assets | 6,675,626 |  | 6,675,626 |  | 6,050,255
Operating Segments [Member] | Midstream Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 33,025 | 18,767 | 93,663 | 48,939 |
Operating income | 31,326 | 25,194 | 101,457 | 69,059 |
Other income (expense) | (367) | (15) | (703) | (13) |
Income (loss) before income taxes | 30,959 | 25,179 | 100,754 | 69,046 |
Property, plant and equipment, net | 841,797 |  | 841,797 |  | 649,923
Total assets | 867,226 |  | 867,226 |  | 663,614
Operating Segments [Member] | Well Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 16,262 | 16,138 | 46,344 | 33,566 |
Operating income | 9,237 | 10,802 | 25,415 | 9,161 |
Other income (expense) | (79) | 30 | (99) | 34 |
Income (loss) before income taxes | 9,158 | 10,832 | 25,316 | 9,195 |
Property, plant and equipment, net | 41,468 |  | 41,468 |  | 46,779
Total assets | 49,285 |  | 49,285 |  | 52,800
Segment Reconciling Items [Member] | Exploration and Production [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 0 | 0 | 0 | 0 |
Segment Reconciling Items [Member] | Midstream Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 42,745 | 28,893 | 119,095 | 76,674 |
Segment Reconciling Items [Member] | Well Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | 40,177 | 31,025 | 114,898 | 68,028 |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from non-affiliates | (82,922) | (59,918) | (233,993) | (144,702) |
Operating income | (8,487) | (7,086) | (24,357) | (7,383) |
Other income (expense) | 0 | 0 | 0 | 0 |
Income (loss) before income taxes | (8,487) | $ (7,086) | (24,357) | $ (7,383) |
Property, plant and equipment, net | (210,895) |  | (210,895) |  | (186,539)
Total assets | $ (175,706) |  | $ (175,706) |  | $ (151,539)

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