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Revenue Recognition - Disaggregated Revenue (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | $ 529,405,000 | $ 573,751,000 | $ 1,105,137,000 | $ 1,047,563,000 |
Contract asset | 0 |  | 0 |  | $ 0
Contract liability | 0 |  | 0 |  | $ 0
Exploration and Production Revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 466,365,000 | 525,557,000 | 983,618,000 | 959,861,000 |
Midstream Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 119,445,000 | 69,408,000 | 226,027,000 | 133,970,000 |
Well Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 39,281,000 | 59,914,000 | 71,912,000 | 104,803,000 |
Operating Segments | Exploration and Production Revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 466,365,000 | 525,557,000 | 983,618,000 | 959,861,000 |
Operating Segments | Exploration and Production Revenues | Crude oil revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 327,977,000 | 363,182,000 | 646,098,000 | 689,492,000 |
Operating Segments | Exploration and Production Revenues | Purchased crude oil sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 106,441,000 | 127,212,000 | 253,577,000 | 194,872,000 |
Operating Segments | Exploration and Production Revenues | Natural gas revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 9,734,000 | 23,059,000 | 41,330,000 | 50,021,000 |
Operating Segments | Exploration and Production Revenues | Purchased natural gas sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 2,920,000 | 496,000 | 4,255,000 | 545,000 |
Operating Segments | Exploration and Production Revenues | NGL revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 19,293,000 | 11,608,000 | 38,358,000 | 24,931,000 |
Operating Segments | Midstream Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 51,601,000 | 29,698,000 | 99,622,000 | 57,620,000 |
Operating Segments | Midstream Services | Purchased crude oil sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 28,000 | 356,000 | 28,000 | 356,000 |
Operating Segments | Midstream Services | Crude oil and natural gas revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 22,875,000 | 17,907,000 | 47,538,000 | 35,936,000 |
Operating Segments | Midstream Services | Produced and flowback water revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 9,473,000 | 9,058,000 | 18,506,000 | 17,934,000 |
Operating Segments | Midstream Services | Total midstream service revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 32,348,000 | 26,965,000 | 66,044,000 | 53,870,000 |
Operating Segments | Midstream Services | Natural gas and NGL revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 17,319,000 | 0 | 30,116,000 | 0 |
Operating Segments | Midstream Services | Freshwater revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 1,906,000 | 2,377,000 | 3,434,000 | 3,394,000 |
Operating Segments | Midstream Services | Total midstream product revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 19,253,000 | 2,733,000 | 33,578,000 | 3,750,000 |
Operating Segments | Well Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 11,439,000 | 18,496,000 | 21,897,000 | 30,082,000 |
Operating Segments | Well Services | Hydraulic fracturing revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 10,628,000 | 17,390,000 | 20,403,000 | 27,816,000 |
Operating Segments | Well Services | Equipment rental revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | $ 811,000 | $ 1,106,000 | $ 1,494,000 | $ 2,266,000 |

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