Supplemental Disclosures (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Supplemental Disclosures [Line Items]
Interest Paid, Net	$ 15,875	$ 12,226
Summary of current accrued liabilities
Total accrued liabilities	151,336		$ 101,460
Accrued evaluated and unproved and unevaluated property costs
Summary of current accrued liabilities
Total accrued liabilities	98,589		54,273
Accrued support equipment and facilities costs
Summary of current accrued liabilities
Total accrued liabilities	15,596		15,139
Accrued lease operating expenses
Summary of current accrued liabilities
Total accrued liabilities	12,613		16,009
Accrued interest on debt
Summary of current accrued liabilities
Total accrued liabilities	8,345		6,541
Accrued asset retirement obligations
Summary of current accrued liabilities
Total accrued liabilities	703		915
Accrued partners’ share of joint interest charges
Summary of current accrued liabilities
Total accrued liabilities	12,479		5,572
Other
Summary of current accrued liabilities
Total accrued liabilities	$ 3,011		$ 3,011