Supplemental Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Summary of current accrued liabilities
Total accrued liabilities	$ 80,754	$ 92,369
Accrued evaluated and unproved and unevaluated property costs
Summary of current accrued liabilities
Total accrued liabilities	51,692	54,586
Accrued support equipment and facilities costs
Summary of current accrued liabilities
Total accrued liabilities	4,307	17,393
Accrued lease operating expenses
Summary of current accrued liabilities
Total accrued liabilities	10,842	7,743
Accrued interest on debt
Summary of current accrued liabilities
Total accrued liabilities	5,805	5,806
Accrued asset retirement obligations
Summary of current accrued liabilities
Total accrued liabilities	61	254
Accrued partners’ share of joint interest charges
Summary of current accrued liabilities
Total accrued liabilities	3,936	4,565
Other
Summary of current accrued liabilities
Total accrued liabilities	$ 4,111	$ 2,022