Supplemental Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Supplemental Disclosures [Line Items]
Total accrued liabilities	$ 191,608	$ 170,855
Accrued evaluated and unproved and unevaluated property costs
Supplemental Disclosures [Line Items]
Total accrued liabilities	100,014	86,318
Accrued midstream property costs
Supplemental Disclosures [Line Items]
Total accrued liabilities	21,840	16,808
Accrued lease operating expenses
Supplemental Disclosures [Line Items]
Total accrued liabilities	20,812	12,705
Accrued interest on debt
Supplemental Disclosures [Line Items]
Total accrued liabilities	18,599	22,448
Accrued asset retirement obligations
Supplemental Disclosures [Line Items]
Total accrued liabilities	1,556	1,350
Accrued partners’ share of joint interest charges
Supplemental Disclosures [Line Items]
Total accrued liabilities	17,165	17,037
Other
Supplemental Disclosures [Line Items]
Total accrued liabilities	$ 11,622	$ 14,189