Acquisition (Details) (USD $)	12 Months Ended			0 Months Ended					0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jul. 03, 2013 10% Senior Notes [Member]	Dec. 31, 2013 10% Senior Notes [Member]	Dec. 31, 2012 10% Senior Notes [Member]	Aug. 19, 2010 10% Senior Notes [Member]	Jul. 03, 2013 Gulf of Mexico Acquisition [Member] platform well	Jul. 03, 2013 Gulf of Mexico Acquisition [Member] General and Administrative Expense [Member] Bridge Loan [Member]
Business Acquisition [Line Items]
Number of wells acquired								16
Number of platforms purchased								7
Principal amount				$ 200,000,000	$ 350,000,000	$ 150,000,000	$ 150,000,000
Interest rate of Senior Notes				10.00%			10.00%
Payments of financing costs	320,000	42,000	517,000	5,000,000
Acquisition-related costs				$ 4,000,000					$ 2,600,000