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Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 501,337 | $ 254,091 | $ 922,553 | $ 539,207
Exploration and Production [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 450,124 | 226,724 | 831,832 | 491,607
Exploration and Production [Member] | Oil Production [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 361,254 | 194,005 | 684,640 | 402,599
Exploration and Production [Member] | Purchased Oil Sales [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 53,707 | 7,905 | 71,695 | 35,536
Exploration and Production [Member] | Natural Gas, Production [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 23,059 | 15,119 | 50,021 | 34,652
Exploration and Production [Member] | Purchased Gas Sales [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 496 | 186 | 545 | 186
Exploration and Production [Member] | Natural Gas Liquid Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 11,608 | 9,509 | 24,931 | 18,634
Midstream Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 32,717 | 15,566 | 60,639 | 30,172
Midstream Services [Member] | Purchased Oil Sales [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,375 | 0 | 3,375 | 0
Midstream Services [Member] | Crude Oil and Natural Gas Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 17,907 | 3,187 | 35,936 | 11,739
Midstream Services [Member] | Water Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 11,435 | 12,379 | 21,328 | 18,433
Well Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,496 | 11,801 | 30,082 | 17,428
Well Services [Member] | Hydraulic Fracturing Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 17,390 | 11,057 | 27,816 | 16,213
Well Services [Member] | Equipment Rental Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 1,106 | $ 744 | $ 2,266 | $ 1,215

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