Supplemental Disclosures (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Supplemental Disclosures [Line Items]
Total accrued liabilities	$ 222,565	$ 170,855
Accrued evaluated and unproved and unevaluated property costs
Supplemental Disclosures [Line Items]
Total accrued liabilities	113,904	86,318
Accrued midstream property costs
Supplemental Disclosures [Line Items]
Total accrued liabilities	32,647	16,808
Accrued lease operating expenses
Supplemental Disclosures [Line Items]
Total accrued liabilities	23,480	12,705
Accrued interest on debt
Supplemental Disclosures [Line Items]
Total accrued liabilities	3,107	22,448
Accrued asset retirement obligations
Supplemental Disclosures [Line Items]
Total accrued liabilities	619	1,350
Accrued partners’ share of joint interest charges
Supplemental Disclosures [Line Items]
Total accrued liabilities	32,769	17,037
Other
Supplemental Disclosures [Line Items]
Total accrued liabilities	$ 16,039	$ 14,189