Acquisition (Details) (USD $)	6 Months Ended		3 Months Ended		0 Months Ended	3 Months Ended		0 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Ten Percent Senior Notes [Member]	Aug. 19, 2010 Ten Percent Senior Notes [Member]	Jul. 03, 2013 Subsequent Event [Member] Ten Percent Senior Notes [Member]	Jun. 30, 2013 Gulf of Mexico Acquisition [Member] General and Administrative Expense [Member]	Jun. 30, 2013 Gulf of Mexico Acquisition [Member] General and Administrative Expense [Member] Bridge Loan [Member]	Jul. 03, 2013 Gulf of Mexico Acquisition [Member] Subsequent Event [Member] platform well	Jul. 03, 2013 Gulf of Mexico Acquisition [Member] Subsequent Event [Member] Bridge Loan [Member]
Business Acquisition [Line Items]
Purchase price								$ 191,800,000
Number of wells acquired								14
Number of wells acquired awaiting completion								2
Number of platforms purchased								7
Principal amount				150,000,000	200,000,000
Interest rate of Senior Notes				10.00%	10.00%
Payments of financing costs	774,000	12,000	500,000		4,000,000
Maximum borrowing capcity	300,000,000								185,000,000
Acquisition-related costs						1,000,000	300,000
Expected acquisition-related costs							$ 2,300,000