Revolving Credit Agreement (Details) (USD $)	1 Months Ended	9 Months Ended	12 Months Ended				1 Months Ended				3 Months Ended
	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 05, 2014	Mar. 11, 2014	Dec. 31, 2013	Sep. 30, 2012 Second amended credit agreement [Member]	Sep. 27, 2012 Second amended credit agreement [Member]	Nov. 05, 2014 Subsequent Event [Member]	Sep. 28, 2012 Third Amended Credit Agreement [Member]	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Maximum [Member]	Sep. 30, 2014 Federal Funds Effective Rate [Member]	Sep. 30, 2014 Base Rate Loan [Member] Minimum [Member]	Sep. 30, 2014 Base Rate Loan [Member] Maximum [Member]	Sep. 30, 2014 Eurodollar [Member] Minimum [Member]	Sep. 30, 2014 Eurodollar [Member] Maximum [Member]	Sep. 30, 2014 Libor Rate [Member]
Revolving Credit Agreement (Textual) [Abstract]
Company amended and restated its senior secured revolving credit agreement							September 28, 2012
Senior secured revolving credit maximum facility								$ 400,000,000		$ 500,000,000
Credit Agreement, maturity date		Dec. 29, 2016
Line of Credit Facility, Current Borrowing Capacity				450,000,000	385,000,000
Line of Credit Conforming Borrowing base				375,000,000	310,000,000
Covenant, additional indebtedness		10,000,000	10,000,000
Line of Credit Facility, Covenant, Debt to EBITDA Ratio	0		4.25
Line of Credit Facility, Interest Rate Increase (Decrease)					(0.25%)
Deferred loan costs		2,000,000	2,000,000
Long-term Line of Credit, Noncurrent		250,000,000	250,000,000			200,000,000
Outstanding letters of credit		600,000	600,000						600,000
Outstanding borrowings bore interest effective rate		2.90%	2.90%
Additional borrowings for working capital requirements									40,000,000
Borrowed under credit agreement									$ 290,000,000
Borrowings interest rate													0.50%					1.00%
Percentage of reserves required to maintain	100.00%
Additional interest rate														0.0050	0.0275	0.0150	0.0375
Line of Credit Facility, Commitment Fee Percentage											0.375%	0.50%