Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Income Taxes
Provision for federal or state income tax prior to company reorganization	$ 0
Additional disclosure
Effective annual tax rate (as a percent)	2.60%
Federal statutory rate (as a percent)	35.00%
Valuation allowance recorded in light of the impairment of oil and gas properties	29.7
Valuation allowance	75.4
Current income taxes	$ 0