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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 421,216 | $ 285,116 |
Operating income | 112,985 | 20,092 |
Other income (expense) | (108,445) | 19,770 |
Income before income taxes | 4,540 | 39,862 |
Property, plant and equipment, net | 7,186,606 |  | $ 6,173,486
Total assets | 7,638,930 |  | 6,615,130
Exploration and Production [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 381,708 | 264,883 |
Midstream Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 64,562 | 37,641 |
Well Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 44,888 | 20,979 |
Operating Segments [Member] | Exploration and Production [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 381,708 | 264,883 |
Operating income | 79,962 | 968 |
Other income (expense) | (108,146) | 19,768 |
Income before income taxes | (28,184) | 20,736 |
Property, plant and equipment, net | 6,600,397 |  | 5,663,323
Total assets | 6,994,927 |  | 6,050,255
Operating Segments [Member] | Midstream Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 27,922 | 14,606 |
Operating income | 32,237 | 20,763 |
Other income (expense) | (258) | (2) |
Income before income taxes | 31,979 | 20,761 |
Property, plant and equipment, net | 732,801 |  | 649,923
Total assets | 752,301 |  | 663,614
Operating Segments [Member] | Well Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 11,586 | 5,627 |
Operating income | 8,148 | (3,592) |
Other income (expense) | (41) | 4 |
Income before income taxes | 8,107 | (3,588) |
Property, plant and equipment, net | 47,310 |  | 46,779
Total assets | 50,605 |  | 52,800
Segment Reconciling Items [Member] | Exploration and Production [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 0 | 0 |
Segment Reconciling Items [Member] | Midstream Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 36,640 | 23,035 |
Segment Reconciling Items [Member] | Well Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 33,302 | 15,352 |
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (69,942) | (38,387) |
Operating income | (7,362) | 1,953 |
Other income (expense) | 0 | 0 |
Income before income taxes | (7,362) | $ 1,953 |
Property, plant and equipment, net | (193,902) |  | (186,539)
Total assets | $ (158,903) |  | $ (151,539)

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