Investment in Oil and Gas Properties - Unaudited (Textuals) (Details) (USD $)	12 Months Ended													0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Mississippian Lime [Member]	Dec. 31, 2012 Mississippian Lime [Member]	Dec. 31, 2013 Woodford [Member] acre	Dec. 31, 2013 Wyoming	Dec. 31, 2012 Arkansas [Member]	Dec. 31, 2013 Uncompleted Wells Equipment and Facilities [Member] Wells	Dec. 31, 2012 Uncompleted Wells Equipment and Facilities [Member] Wells	Dec. 31, 2013 2012 [Member]	Dec. 31, 2013 2011 [Member]	Dec. 31, 2013 Prior to 2011	Jul. 03, 2013 Ten Percent Senior Notes [Member] Gulf of Mexico Acquisition [Member]
Reserve Quantities [Line Items]
Purchase price														$ 188,800,000
Unevaluated acres acquired						13,500
Sale of oil and gas properties	19,913,000	837,000	14,000,000	6,100,000	14,500,000	10,400,000	1,000,000	8,500,000
Percent of saltwater disposal systems and related surface assets sold						50.00%
Receipt of payment, achievement of production metrics		14,000,000
Unevaluated oil and gas properties	98,400,000	71,700,000							11,300,000	12,700,000	50,300,000	12,100,000	36,000,000
Exploratory wells drilled, unevaluated									19	17
Interest costs capitalized	6,600,000	7,000,000	7,000,000
Percentage of unevaluated costs capitalized in period											51.00%	12.00%	37.00%
Expected period to evaluate majority of unevaluated properties	3 years
Unevaluated costs expected to be evaluated in 2013	$ 34,400,000