Revolving Credit Agreement (Details) (USD $)	0 Months Ended	1 Months Ended		7 Months Ended	9 Months Ended							9 Months Ended					9 Months Ended		9 Months Ended
	Feb. 08, 2012	Feb. 28, 2012	Jan. 30, 2012	Sep. 30, 2012	Sep. 30, 2012	Nov. 14, 2012	Nov. 09, 2012	Oct. 09, 2012	Jan. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Before amendment [Member]	Sep. 30, 2012 Second amended credit agreement [Member]	Sep. 30, 2012 Third amended credit agreement [Member]	Sep. 28, 2012 Third amended credit agreement [Member]	Feb. 28, 2012 February 2012 [Member]	Sep. 30, 2012 Federal Reserve System [Member]	Sep. 30, 2012 Base rate loan [Member]	Sep. 30, 2012 LIBOR rate [Member]	Sep. 30, 2012 Eurodollar Loan [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Maximum [Member] Base rate loan [Member]	Sep. 30, 2012 Maximum [Member] Eurodollar Loan [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Minimum [Member] Base rate loan [Member]	Sep. 30, 2012 Minimum [Member] Eurodollar Loan [Member]
Revolving Credit Agreement (Textual) [Abstract]
Senior secured revolving credit maximum facility										$ 400,000,000	$ 150,000,000			$ 500,000,000
Borrowing base		125,000,000								125,000,000				200,000,000	100,000,000
Conforming borrowing base														165,000,000
Credit facility, outstanding				106,000,000	106,000,000		15,000,000	14,000,000	123,000,000	113,000,000
Borrowings interest rate																5.30%		1.00%
Additional interest rate																					2.25%	3.25%		0.75%	1.75%
Credit facility fee																				0.50%			0.375%
Borrowings interest rate description																	If the Company borrows funds as a base rate loan, such borrowings will bear interest at a rate equal to the higher of (i) the prime rate for such day or(ii) the Federal Funds Effective Rate on such day, plus 0.50% weighted average of rates used in overnight federal funds transactions with members of the Federal Reserve System plus 0.50% or (iii) the daily adjusting LIBOR rate plus 1.0% plus, in each case, an amount from 1.75% to 3.25% of such outstanding loan depending on the level of borrowings under the agreement.		If the Company borrows funds as a Eurodollar loan, such borrowings will bear interest at a rate equal to (i) the quotient obtained by dividing (A) the LIBOR rate by (B) a percentage equal to 100% minus the maximum rate during such interest calculation period at which RBC is required to maintain reserves on Eurocurrency Liabilities (as defined in Regulation D of the Board of Governors of the Federal Reserve System) plus (ii) an amount from 1.75% to 3.25% of such outstanding loan depending on the level of borrowings under the agreement
Net cash proceeds from secondary public offering					146,510,000								25,000,000
Conforming borrowing base description													The borrowing base will automatically be reduced to an amount equal to the conforming borrowing base on the earlier of (i) December 31, 2013 or (ii) the closing of a secondary public offering of equity interests by the Company that results in net cash proceeds to the Company in an amount greater than or equal to $25 million.
Conforming borrowing base date													Dec. 31, 2013
Company amended and restated its senior secured revolving credit agreement												December 2011	September 28, 2012
Revolving Credit Agreement (Additional Textual) [Abstract]
Credit Agreement, maturity date					Dec. 31, 2016
The borrowing base under the Credit Agreement determined					semi-annually
Outstanding letters of credit				1,100,000	1,100,000	1,100,000
Additional outstanding borrowings under the Credit Agreement			10,000,000	106,000,000
Repayment of the outstanding under the Credit Agreement in full	123,000,000	123,000,000
Available for additional borrowings				$ 92,900,000	$ 92,900,000
Outstanding borrowings bore interest effective rate				3.30%	3.30%
Percentage of reserves required to maintain					100.00%
Total debt outstanding to EBITDA					4.0
Current ratio					1.0
Federal Funds Effective Plus Rate					0.50%