Supplemental Disclosures (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Summary of current accrued liabilities
Total accrued liabilities	$ 102,327	$ 109,502
Accrued evaluated and unproved and unevaluated property costs
Summary of current accrued liabilities
Total accrued liabilities	54,654	86,259
Accrued support equipment and facilities costs
Summary of current accrued liabilities
Total accrued liabilities	6,815	4,290
Accrued lease operating expenses
Summary of current accrued liabilities
Total accrued liabilities	12,970	9,034
Accrued interest on borrowings under the Credit Agreement and the Notes
Summary of current accrued liabilities
Total accrued liabilities	12,757	206
Accrued asset retirement obligations
Summary of current accrued liabilities
Total accrued liabilities	411	311
Accrued partners’ share of joint interest charges
Summary of current accrued liabilities
Total accrued liabilities	4,081	3,767
Accrued Stock-Based Compensation [Member]
Summary of current accrued liabilities
Total accrued liabilities	1,082	0
Other
Summary of current accrued liabilities
Total accrued liabilities	$ 9,557	$ 5,635