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Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 458,382 | $ 294,459 | $ 1,243,826 | $ 912,596
Revenue, Remaining Performance Obligation, Amount | 0 |  | 0 |
Permian |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 311,013 | 123,433 | 801,306 | 307,986
South Texas & Gulf Coast |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 147,369 | 135,818 | 385,284 | 480,630
Rocky Mountain |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 0 | $ 35,208 | $ 57,236 | $ 123,980
Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Relative percentage | 100.00% | 100.00% | 100.00% | 100.00%
Sales Revenue, Net | Geographic Concentration Risk | Permian |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Relative percentage | 68.00% | 42.00% | 64.00% | 34.00%
Sales Revenue, Net | Geographic Concentration Risk | South Texas & Gulf Coast |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Relative percentage | 32.00% | 46.00% | 31.00% | 53.00%
Sales Revenue, Net | Geographic Concentration Risk | Rocky Mountain |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Relative percentage | 0.00% | 12.00% | 5.00% | 13.00%
Oil Revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 287,522 | $ 154,203 | $ 814,732 | $ 450,701
Oil Revenue [Member] | Permian |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 270,086 | 107,248 | 703,516 | 267,301
Oil Revenue [Member] | South Texas & Gulf Coast |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 17,436 | 13,726 | 56,365 | 65,662
Oil Revenue [Member] | Rocky Mountain |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 | 33,229 | 54,851 | 117,738
Natural Gas Revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 96,810 | 86,265 | 259,983 | 289,156
Natural Gas Revenue [Member] | Permian |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 40,364 | 16,034 | 96,974 | 40,280
Natural Gas Revenue [Member] | South Texas & Gulf Coast |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 56,446 | 69,069 | 161,414 | 245,030
Natural Gas Revenue [Member] | Rocky Mountain |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 | 1,162 | 1,595 | 3,846
Oil and Condensate Revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 74,050 | 53,991 | 169,111 | 172,739
Oil and Condensate Revenue [Member] | Permian |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 563 | 151 | 816 | 405
Oil and Condensate Revenue [Member] | South Texas & Gulf Coast |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 73,487 | 53,023 | 167,505 | 169,938
Oil and Condensate Revenue [Member] | Rocky Mountain |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 0 | $ 817 | $ 790 | $ 2,396

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