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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | The tables below present the disaggregation of oil, gas, and NGL production revenue by product type for each of the Company’s operating regions for the years ended December 31, 2018, 2017, and 2016:
| For the year ended December 31, 2018
| Permian |  | South Texas & Gulf Coast |  | Rocky Mountain |  | Total
| (in thousands)
Oil, gas, and NGL production revenue: |  |  |  |  |  |  |
Oil production revenue | $ | 938,004 |  |  | $ | 72,821 |  |  | $ | 54,851 |  |  | $ | 1,065,676 |
Gas production revenue | 125,603 |  |  | 227,252 |  |  | 1,595 |  |  | 354,450 |
NGL production revenue | 1,000 |  |  | 214,441 |  |  | 790 |  |  | 216,231 |
Total | $ | 1,064,607 |  |  | $ | 514,514 |  |  | $ | 57,236 |  |  | $ | 1,636,357 |
Relative percentage | 65 | % |  | 32 | % |  | 3 | % |  | 100 | %
____________________________________________ Note: Amounts may not calculate due to rounding.
| For the year ended December 31, 2017
| Permian |  | South Texas & Gulf Coast |  | Rocky Mountain |  | Total
| (in thousands)
Oil, gas, and NGL production revenue: |  |  |  |  |  |  |
Oil production revenue | $ | 419,732 |  |  | $ | 82,674 |  |  | $ | 151,844 |  |  | $ | 654,250 |
Gas production revenue | 61,781 |  |  | 301,780 |  |  | 5,849 |  |  | 369,410 |
NGL production revenue | 547 |  |  | 226,031 |  |  | 3,545 |  |  | 230,123 |
Total | $ | 482,060 |  |  | $ | 610,485 |  |  | $ | 161,238 |  |  | $ | 1,253,783 |
Relative percentage | 38 | % |  | 49 | % |  | 13 | % |  | 100 | %
____________________________________________ Note: Amounts may not calculate due to rounding.
| For the year ended December 31, 2016
| Permian |  | South Texas & Gulf Coast |  | Rocky Mountain |  | Total
| (in thousands)
Oil, gas, and NGL production revenue: |  |  |  |  |  |  |
Oil production revenue | $ | 117,399 |  |  | $ | 189,313 |  |  | $ | 305,126 |  |  | $ | 611,838 |
Gas production revenue | 17,315 |  |  | 308,829 |  |  | 11,144 |  |  | 337,288 |
NGL production revenue | 92 |  |  | 225,821 |  |  | 3,387 |  |  | 229,300 |
Total | $ | 134,806 |  |  | $ | 723,963 |  |  | $ | 319,657 |  |  | $ | 1,178,426 |
Relative percentage | 11 | % |  | 62 | % |  | 27 | % |  | 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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