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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | The tables below present oil, gas, and NGL production revenue by product type for each of the Company’s operating areas for the years ended December 31, 2020, 2019, and 2018:
| For the year ended December 31, 2020
| Midland Basin |  | South Texas |  | Total
| (in thousands)
Oil production revenue | $ | 802,494 |  |  | $ | 51,074 |  |  | $ | 853,568 |
Gas production revenue | 76,759 |  |  | 110,700 |  |  | 187,459 |
NGL production revenue | 324 |  |  | 84,837 |  |  | 85,161 |
Total | $ | 879,577 |  |  | $ | 246,611 |  |  | $ | 1,126,188 |
Relative percentage | 78 | % |  | 22 | % |  | 100 | %
____________________________________________ Note: Amounts may not calculate due to rounding.
| For the year ended December 31, 2019
| Midland Basin |  | South Texas |  | Total
| (in thousands)
Oil production revenue | $ | 1,119,786 |  |  | $ | 63,426 |  |  | $ | 1,183,212 |
Gas production revenue | 75,827 |  |  | 186,702 |  |  | 262,529 |
NGL production revenue | 123 |  |  | 139,886 |  |  | 140,009 |
Total | $ | 1,195,736 |  |  | $ | 390,014 |  |  | $ | 1,585,750 |
Relative percentage | 75 | % |  | 25 | % |  | 100 | %
____________________________________________ Note: Amounts may not calculate due to rounding.
| For the year ended December 31, 2018
| Midland Basin |  | South Texas |  | Rocky Mountain (1) |  | Total
| (in thousands)
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. (1) Following the divestiture of the Company’s remaining assets in the Rocky Mountain region during the first half of 2018, there has been no production revenue from this region after the second quarter of 2018.

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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=121604090&loc=SL49130545-203045 + Details
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