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Revenue from Contracts with Customers Disaggregation of oil, gas, and NGL production revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 1,126,188 | $ 1,585,750 | $ 1,636,357
Concentration Risk, Percentage | 100.00% | 100.00% | 100.00%
Revenue, Remaining Performance Obligation, Amount | $ 0 |  |
Midland Basin [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 879,577 | $ 1,195,736 | $ 1,064,607
South Texas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 246,611 | $ 390,014 | 514,514
Rocky Mountain [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 57,236
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Midland Basin [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 78.00% | 75.00% | 65.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | South Texas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 22.00% | 25.00% | 32.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Rocky Mountain [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage |  |  | 3.00%
Oil production revenue [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 853,568 | $ 1,183,212 | $ 1,065,676
Oil production revenue [Member] | Midland Basin [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 802,494 | 1,119,786 | 938,004
Oil production revenue [Member] | South Texas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 51,074 | 63,426 | 72,821
Oil production revenue [Member] | Rocky Mountain [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | 54,851
Gas production revenue [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 187,459 | 262,529 | 354,450
Gas production revenue [Member] | Midland Basin [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 76,759 | 75,827 | 125,603
Gas production revenue [Member] | South Texas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 110,700 | 186,702 | 227,252
Gas production revenue [Member] | Rocky Mountain [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | 1,595
NGL production revenue [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 85,161 | 140,009 | 216,231
NGL production revenue [Member] | Midland Basin [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 324 | 123 | 1,000
NGL production revenue [Member] | South Texas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 84,837 | $ 139,886 | 214,441
NGL production revenue [Member] | Rocky Mountain [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 790

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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