Supplemental Disclosures (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Supplemental Disclosures [Line Items]
Interest Paid, Net	$ 14,542	$ 13,370
Summary of current accrued liabilities
Total accrued liabilities	158,345		$ 101,460
Accrued evaluated and unproved and unevaluated property costs
Summary of current accrued liabilities
Total accrued liabilities	90,789		54,273
Accrued support equipment and facilities costs
Summary of current accrued liabilities
Total accrued liabilities	15,401		15,139
Accrued lease operating expenses
Summary of current accrued liabilities
Total accrued liabilities	14,217		16,009
Accrued interest on debt
Summary of current accrued liabilities
Total accrued liabilities	18,228		6,541
Accrued asset retirement obligations
Summary of current accrued liabilities
Total accrued liabilities	618		915
Accrued partners’ share of joint interest charges
Summary of current accrued liabilities
Total accrued liabilities	18,018		5,572
Other
Summary of current accrued liabilities
Total accrued liabilities	$ 1,074		$ 3,011