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Disaggregation of oil, gas, and NGL production revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 389,419 | $ 458,382 | $ 1,136,749 | $ 1,243,826
Revenue, Remaining Performance Obligation, Amount | 0 |  | 0 |
Oil production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 292,857 | 287,522 | 836,062 | 814,732
Gas production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 64,047 | 96,810 | 194,384 | 259,983
NGL production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 32,515 | 74,050 | 106,303 | 169,111
Midland Basin [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 295,265 | 311,013 | 840,978 | 801,306
Midland Basin [Member] | Oil production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 277,361 | 270,086 | 791,055 | 703,516
Midland Basin [Member] | Gas production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 17,780 | 40,364 | 49,821 | 96,974
Midland Basin [Member] | NGL production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 124 | 563 | 102 | 816
South Texas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 94,154 | 147,369 | 295,771 | 385,284
South Texas [Member] | Oil production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 15,496 | 17,436 | 45,007 | 56,365
South Texas [Member] | Gas production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 46,267 | 56,446 | 144,563 | 161,414
South Texas [Member] | NGL production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 32,391 | $ 73,487 | 106,201 | 167,505
Rocky Mountain [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | 0 | 57,236
Rocky Mountain [Member] | Oil production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | 0 | 54,851
Rocky Mountain [Member] | Gas production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | 0 | 1,595
Rocky Mountain [Member] | NGL production revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 0 | $ 790
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Relative percentage | 100.00% | 100.00% | 100.00% | 100.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Midland Basin [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Relative percentage | 76.00% | 68.00% | 74.00% | 64.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | South Texas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Relative percentage | 24.00% | 32.00% | 26.00% | 31.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Rocky Mountain [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Relative percentage |  |  | 0.00% | 5.00%

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