Revolving Credit Agreement (Details Textual) (USD $)	1 Months Ended	12 Months Ended						1 Months Ended					12 Months Ended								0 Months Ended		12 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Feb. 29, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Aug. 07, 2013	Jun. 04, 2013	Mar. 11, 2013	Sep. 30, 2012 Third amended credit agreement [Member]	Mar. 13, 2014 Subsequent Event [Member]	Mar. 12, 2014 Subsequent Event [Member]	Mar. 07, 2014 Subsequent Event [Member]	Dec. 31, 2012 Subsequent Event [Member]	Dec. 31, 2013 LIBOR rate [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Maximum [Member] Third amended credit agreement [Member]	Aug. 07, 2013 Maximum [Member] Third amended credit agreement [Member]	Jun. 04, 2013 Maximum [Member] Third amended credit agreement [Member]	Mar. 11, 2013 Maximum [Member] Third amended credit agreement [Member]	Dec. 31, 2012 Maximum [Member] Third amended credit agreement [Member]	Sep. 28, 2012 Maximum [Member] Third amended credit agreement [Member]	Mar. 12, 2014 Maximum [Member] Subsequent Event [Member]	Mar. 12, 2014 Maximum [Member] Subsequent Event [Member] Third amended credit agreement [Member]	Dec. 31, 2013 Maximum [Member] Base rate loan [Member]	Dec. 31, 2013 Maximum [Member] Eurodollar Loan [Member]	Aug. 07, 2013 Minimum [Member]	Dec. 31, 2013 Minimum [Member]	Mar. 12, 2014 Minimum [Member] Subsequent Event [Member]	Dec. 31, 2013 Minimum [Member] Base rate loan [Member]	Dec. 31, 2013 Minimum [Member] Eurodollar Loan [Member]
Revolving Credit Agreement (Textual) [Abstract]
Company amended and restated its senior secured revolving credit agreement								September 28, 2012
Borrowings under the credit agreement															$ 500,000,000	$ 350,000,000	$ 280,000,000	$ 255,000,000	$ 215,000,000	$ 400,000,000
Credit Agreement, maturity date		Dec. 29, 2016
The borrowing base under the Credit Agreement determined		semi-annually
Conforming borrowing base					275,000,000	245,000,000	220,000,000			310,000,000
Reduction of borrowing base by issuance of senior unsecured notes covenant																									10,000,000.0		10,000,000
Debt to EBITDA ratio covenant																					4.25
Decrease to interest rate										0.25%
Senior secured revolving credit maximum facility																						385,000,000
Additional borrowings for working capital requirements									50,000,000
Repayments of Lines of Credit	123,000,000	130,000,000	123,000,000	103,000,000
Long-term Line of Credit, Noncurrent		200,000,000	150,000,000						250,000,000
Borrowings interest rate													1.00%
Additional interest rate																							0.0300	0.0400				0.0075	0.0175
Credit facility fee														0.50%												0.375%
Repay deficit in agreement Period		6 months
Additional deferred loan cost		1,100,000							800,000		800,000
Outstanding letters of credit		300,000							300,000			1,300,000
Unamortized Deferred Finance Costs		$ 2,100,000
Outstanding borrowings bore interest effective rate		3.30%
Federal Funds Effective Plus Rate		0.50%
Percentage of reserves required to maintain		100.00%
Current ratio		1.0
Total debt outstanding to EBITDA		4.0