Supplemental Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Supplemental Disclosures [Line Items]
Total accrued liabilities	$ 197,305	$ 200,695
Accrued evaluated and unproved and unevaluated property costs
Supplemental Disclosures [Line Items]
Total accrued liabilities	107,173	72,376
Accrued midstream properties costs
Supplemental Disclosures [Line Items]
Total accrued liabilities	40,781	46,402
Accrued lease operating expenses
Supplemental Disclosures [Line Items]
Total accrued liabilities	20,849	18,223
Accrued interest on debt
Supplemental Disclosures [Line Items]
Total accrued liabilities	2,861	18,569
Accrued asset retirement obligations
Supplemental Disclosures [Line Items]
Total accrued liabilities	515	619
Accrued partners’ share of joint interest charges
Supplemental Disclosures [Line Items]
Total accrued liabilities	18,202	14,322
Accrued payable related to purchased natural gas
Supplemental Disclosures [Line Items]
Total accrued liabilities	1,770	17,806
Other
Supplemental Disclosures [Line Items]
Total accrued liabilities	$ 5,154	$ 12,378