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Revenue from Contracts with Customers (Tables) | 9 Months Ended
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Sep. 30, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of oil, gas, and NGL production revenue [Table Text Block] | The tables below present oil, gas, and NGL production revenue by product type for each of the Company’s operating regions for the three and nine months ended September 30, 2019, and 2018:
| Midland Basin |  | South Texas |  | Total
| Three Months Ended September 30, |  | Three Months Ended September 30, |  | Three Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
| (in thousands)
Oil production revenue | $ | 277,361 |  |  | $ | 270,086 |  |  | $ | 15,496 |  |  | $ | 17,436 |  |  | $ | 292,857 |  |  | $ | 287,522 |
Gas production revenue | 17,780 |  |  | 40,364 |  |  | 46,267 |  |  | 56,446 |  |  | 64,047 |  |  | 96,810 |
NGL production revenue | 124 |  |  | 563 |  |  | 32,391 |  |  | 73,487 |  |  | 32,515 |  |  | 74,050 |
Total | $ | 295,265 |  |  | $ | 311,013 |  |  | $ | 94,154 |  |  | $ | 147,369 |  |  | $ | 389,419 |  |  | $ | 458,382 |
Relative percentage | 76 | % |  | 68 | % |  | 24 | % |  | 32 | % |  | 100 | % |  | 100 | %
____________________________________________ Note: Amounts may not calculate due to rounding.
| Midland Basin |  | South Texas |  | Rocky Mountain |  | Total
| Nine Months Ended September 30, |  | Nine Months Ended September 30, |  | Nine Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
| (in thousands)
Oil production revenue | $ | 791,055 |  |  | $ | 703,516 |  |  | $ | 45,007 |  |  | $ | 56,365 |  |  | $ | — |  |  | $ | 54,851 |  |  | $ | 836,062 |  |  | $ | 814,732 |
Gas production revenue | 49,821 |  |  | 96,974 |  |  | 144,563 |  |  | 161,414 |  |  | — |  |  | 1,595 |  |  | 194,384 |  |  | 259,983 |
NGL production revenue | 102 |  |  | 816 |  |  | 106,201 |  |  | 167,505 |  |  | — |  |  | 790 |  |  | 106,303 |  |  | 169,111 |
Total | $ | 840,978 |  |  | $ | 801,306 |  |  | $ | 295,771 |  |  | $ | 385,284 |  |  | $ | — |  |  | $ | 57,236 |  |  | $ | 1,136,749 |  |  | $ | 1,243,826 |
Relative percentage | 74 | % |  | 64 | % |  | 26 | % |  | 31 | % |  | — | % |  | 5 | % |  | 100 | % |  | 100 | %
____________________________________________ Note: Amounts may not calculate due to rounding.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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