Supplemental Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Supplemental Disclosures [Line Items]
Total accrued liabilities	$ 189,115	$ 200,695
Accrued evaluated and unproved and unevaluated property costs
Supplemental Disclosures [Line Items]
Total accrued liabilities	77,015	72,376
Accrued midstream properties costs
Supplemental Disclosures [Line Items]
Total accrued liabilities	55,457	46,402
Accrued lease operating expenses
Supplemental Disclosures [Line Items]
Total accrued liabilities	22,026	18,223
Accrued interest on debt
Supplemental Disclosures [Line Items]
Total accrued liabilities	18,282	18,569
Accrued asset retirement obligations
Supplemental Disclosures [Line Items]
Total accrued liabilities	539	619
Accrued partners’ share of joint interest charges
Supplemental Disclosures [Line Items]
Total accrued liabilities	4,541	14,322
Accrued payable related to purchased natural gas
Supplemental Disclosures [Line Items]
Total accrued liabilities	2,318	17,806
Other
Supplemental Disclosures [Line Items]
Total accrued liabilities	$ 8,937	$ 12,378