Subsequent Events (Details) (USD $)	1 Months Ended		2 Months Ended
	Aug. 31, 2012 acre	Jan. 30, 2012	Aug. 31, 2012	Aug. 14, 2012	Jun. 30, 2012	Jan. 31, 2012	Dec. 31, 2011
Subsequent Events (Textual) [Abstract]
Borrowings outstanding under the Credit Agreement				$ 90,000,000	$ 1,300,000	$ 123,000,000	$ 113,000,000
Subsequent Event (Additional Textual) [Abstract]
Additional borrowings		10,000,000	30,000,000
Outstanding borrowings effective interest rate				3.30%
Minimum commitment for its participation in the well	2,400,000
Number of acres acquired, gross	4,911
Number of acres acquired, net	2,873
Payments to acquire acreage	8,600,000
Letters of credit [Member]
Subsequent Events (Textual) [Abstract]
Borrowings outstanding under the Credit Agreement				$ 1,300,000