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Debt (Details) - USD ($)					3 Months Ended		9 Months Ended
Debt (Details) - USD ($)	Nov. 01, 2016	Aug. 29, 2016	Nov. 26, 2013	May 08, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 30, 2016	Dec. 31, 2015	May 15, 2015	Aug. 15, 2013	Oct. 22, 2012
Debt [Line Items]
Deferred financing costs					$ (9,312,000)		$ (9,312,000)			$ (6,616,000)
Total debt					581,574,000		581,574,000			344,589,000
Current portion of long-term debt, including premium and deferred financing costs					(114,342,000)		(114,342,000)			0
Long-term debt					467,232,000		467,232,000			344,589,000
Senior Notes [Abstract]
Loss on extinguishment of debt					(9,525,000)	$ 0	(9,525,000)	$ 0
Current portion of long-term debt					114,342,000		114,342,000			0
Restricted cash deposits with trustee					122,856,000		122,856,000			0
Interest paid							16,200,000	$ 10,600,000
Medium-term notes [Member] \| Term Loan Due 2022 [Member]
Debt [Line Items]
Total debt					50,000,000		$ 50,000,000			50,000,000
Term Loan [Abstract]
Term Loan, Face Amount											$ 50,000,000
Term Loan, Average Interest Rate During Period							2.20%
Term Loan, Average Interest Rate During Period With Patronage Credits							1.50%
Senior Notes [Abstract]
Senior Notes, Face Amount											$ 50,000,000
Medium-term notes [Member] \| Term Loan Due 2022 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Term Loan [Abstract]
Basis spread on variable interest rate							1.75%
Medium-term notes [Member] \| Term Loan Due 2022 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Term Loan [Abstract]
Basis spread on variable interest rate							2.25%
Medium-term notes [Member] \| Term Loan Due 2022 [Member] \| Base Rate [Member] \| Minimum [Member]
Term Loan [Abstract]
Basis spread on variable interest rate							0.75%
Medium-term notes [Member] \| Term Loan Due 2022 [Member] \| Base Rate [Member] \| Maximum [Member]
Term Loan [Abstract]
Basis spread on variable interest rate							1.25%
Medium-term notes [Member] \| Term Loan Due 2026 [Member]
Debt [Line Items]
Total debt					75,000,000		$ 75,000,000			0
Term Loan [Abstract]
Term Loan, Face Amount									$ 75,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five					$ 10,000,000		$ 10,000,000
Debt Instrument, Covenant, Capitalization Ratio, Maximum (as a percent)					60.00%		60.00%
Debt Instrument, Covenant, Consolidated Net Worth, Minimum					$ 350,000,000		$ 350,000,000
Debt Instrument, Covenant, Available Liquidity, Minimum					100,000,000		100,000,000
Threshold of amount of capital expenditures made during four consecutive quarters, maximum					50,000,000		$ 50,000,000
Term Loan, Average Interest Rate During Period							2.34%
Term Loan, Average Interest Rate During Period With Patronage Credits							1.60%
Senior Notes [Abstract]
Senior Notes, Face Amount									$ 75,000,000
Medium-term notes [Member] \| Term Loan Due 2026 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Term Loan [Abstract]
Basis spread on variable interest rate							1.875%
Medium-term notes [Member] \| Term Loan Due 2026 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Term Loan [Abstract]
Basis spread on variable interest rate							2.125%
Medium-term notes [Member] \| Term Loan Due 2026 [Member] \| Base Rate [Member] \| Minimum [Member]
Term Loan [Abstract]
Basis spread on variable interest rate							0.875%
Medium-term notes [Member] \| Term Loan Due 2026 [Member] \| Base Rate [Member] \| Maximum [Member]
Term Loan [Abstract]
Basis spread on variable interest rate							1.125%
Senior notes [Member] \| 6.375% Senior Notes Due 2020 [Member]
Debt [Line Items]
Unamortized premium on 6.375% senior notes					393,000		$ 393,000			1,215,000
Total debt					115,493,000		115,493,000			299,990,000
Current portion of long-term debt, including premium and deferred financing costs		$ (115,500,000)
Term Loan [Abstract]
Term Loan, Face Amount		300,000,000
Senior Notes [Abstract]
Senior Notes, Face Amount		300,000,000
Extinguishment of Debt, Amount		184,500,000
Loss on extinguishment of debt		(9,500,000)
Tender premium paid for redemption of debt		(7,600,000)
Net write-off of unamortized deferred financing costs and unamortized premium		(1,900,000)
Current portion of long-term debt		115,500,000
Restricted cash deposits with trustee		122,900,000
Senior notes [Member] \| 6.375% Senior Notes Due 2020 [Member] \| Subsequent Event [Member]
Senior Notes [Abstract]
Loss on extinguishment of debt	$ (4,800,000)
Tender premium paid for redemption of debt	(3,700,000)
Net write-off of unamortized deferred financing costs and unamortized premium	$ (1,100,000)
2020 Notes, Redemption Period, End Date	Nov. 01, 2016
Senior notes [Member] \| 250 million original new 6.375% Senior Notes due 2020 [Member]
Senior Notes [Abstract]
Interest rate				6.375%
Debt Exchange, Original Debt, Amount				$ 250,000,000
Percentage of Senior Notes tendered and accepted for exchange				100.00%
Senior notes [Member] \| 50 million additional new 6.375% Senior Notes due 2020 [Member]
Senior Notes [Abstract]
Interest rate			6.375%
Debt Exchange, Original Debt, Amount			$ 49,990,000
Percentage of Senior Notes tendered and accepted for exchange			99.98%
Senior notes [Member] \| $250 million original 6.375% Senior Notes due 2020 [Member]
Term Loan [Abstract]
Term Loan, Face Amount													$ 250,000,000
Senior Notes [Abstract]
Senior Notes, Face Amount													$ 250,000,000
Interest rate													6.375%
Senior notes [Member] \| 50 million additional old 6.375% Senior Notes due 2020 [Member]
Term Loan [Abstract]
Term Loan, Face Amount												$ 50,000,000
Senior Notes [Abstract]
Senior Notes, Face Amount												$ 50,000,000
Premium rate on 6.375% senior notes												103.50%
Senior notes [Member] \| 5.625% Senior Notes Due 2024 [Member]
Debt [Line Items]
Total debt					$ 350,000,000		$ 350,000,000			$ 0
Term Loan [Abstract]
Term Loan, Face Amount		350,000,000
Senior Notes [Abstract]
Senior Notes, Face Amount		$ 350,000,000
Interest rate		5.625%