Supplemental Disclosures (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Summary of current accrued liabilities
Total accrued liabilities	$ 128,845	$ 109,502
Accrued evaluated and unproved and unevaluated property costs
Summary of current accrued liabilities
Total accrued liabilities	96,432	86,259
Accrued support equipment and facilities costs
Summary of current accrued liabilities
Total accrued liabilities	11,302	4,290
Accrued stock-based compensation
Summary of current accrued liabilities
Total accrued liabilities	325	0
Accrued lease operating expenses
Summary of current accrued liabilities
Total accrued liabilities	7,942	9,034
Accrued interest on borrowings under Credit Agreement
Summary of current accrued liabilities
Total accrued liabilities	292	206
Accrued asset retirement obligations
Summary of current accrued liabilities
Total accrued liabilities	268	311
Accrued partners’ share of joint interest charges
Summary of current accrued liabilities
Total accrued liabilities	6,516	3,767
Other
Summary of current accrued liabilities
Total accrued liabilities	$ 5,768	$ 5,635