Supplemental Disclosures (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Summary of current accrued liabilities
Total accrued liabilities	$ 170,855	$ 174,348
Other	14,189	4,418
Accrued evaluated and unproved and unevaluated property costs
Summary of current accrued liabilities
Total accrued liabilities	86,318	105,347
Accrued midstream properties costs
Summary of current accrued liabilities
Total accrued liabilities	16,808	14,823
Accrued lease operating expenses
Summary of current accrued liabilities
Total accrued liabilities	12,705	12,611
Accrued interest on debt
Summary of current accrued liabilities
Total accrued liabilities	22,448	8,345
Accrued asset retirement obligations
Summary of current accrued liabilities
Total accrued liabilities	1,350	1,176
Accrued partners’ share of joint interest charges
Summary of current accrued liabilities
Total accrued liabilities	$ 17,037	$ 27,628