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Debt (Details)					12 Months Ended
Debt (Details)	Nov. 01, 2016 USD ($)	Aug. 29, 2016 USD ($)	Nov. 26, 2013 USD ($)	May 08, 2013 USD ($)	Dec. 31, 2016 USD ($) Integer8	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 30, 2016 USD ($)	May 15, 2015 USD ($)	Aug. 15, 2013 USD ($)	Oct. 22, 2012 USD ($)
Debt [Line Items]
Long-term Debt					$ 437,629,000	$ 344,589,000
Deferred financing costs					(7,371,000)	(6,616,000)
Senior Notes [Abstract]
Gain (loss) on extinguishment of debt					(14,304,000)	0	$ 0
Interest paid					21,000,000	20,600,000	$ 20,200,000
Maturities of Long-term Debt [Abstract]
2017					0
2018					0
2019					0
2020					0
2021					0
Thereafter					445,000,000
Medium-term Notes [Member] \| Term Loan Due 2022 [Member]
Debt [Line Items]
Long-term Debt					$ 50,000,000	50,000,000
Term Loan [Abstract]
Term Loan, Face Amount									$ 50,000,000
Term Loan, Average Interest Rate During Period					2.23%
Term Loan, Average interest rate during period with patronage credits					1.50%
Senior Notes [Abstract]
Long-term debt									$ 50,000,000
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 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 2026 [Member]
Debt [Line Items]
Long-term Debt					$ 45,000,000	0
Term Loan [Abstract]
Term Loan, Face Amount								$ 75,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five					$ 10,000,000
Number of reborrowing instances allowed \| Integer8					3
Minimum reborrowing amounts					$ 10,000,000
Debt Instrument, Unused Borrowing Capacity, Fee (as a percentage)					0.325%
Debt Instrument, Unused Borrowing Capacity, Amount					$ 30,000,000
Debt Instrument, Covenant, Capitalization Ratio, Maximum (as a percent)					60.00%
Debt Instrument, Covenant, Consolidated Net Worth, Minimum					$ 350,000,000
Debt Instrument, Covenant, Available Liquidity, Minimum					100,000,000
Threshold of amount of capital expenditures made during four consecutive quarters, maximum					$ 50,000,000
Term Loan, Average Interest Rate During Period					2.37%
Term Loan, Average interest rate during period with patronage credits					1.60%
Senior Notes [Abstract]
Long-term debt								$ 75,000,000
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%
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%
Senior notes [Member] \| 6.375% Senior Notes Due 2020 [Member]
Debt [Line Items]
Long-term Debt					$ 0	299,990,000
Unamortized premium on 6.375% senior notes					0	1,215,000
Term Loan [Abstract]
Term Loan, Face Amount		$ 300,000,000
Senior Notes [Abstract]
Long-term debt		300,000,000
Extinguishment of Debt, Amount	$ 115,500,000	184,500,000
Gain (loss) on extinguishment of debt					(14,300,000)
Debt extinguishment premiums paid					(11,300,000)
Net write-off of unamortized deferred financing costs and unamortized premium					(3,000,000)
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] [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 old 6.375% Senior Notes due 2020 [Member]
Term Loan [Abstract]
Term Loan, Face Amount											$ 250,000,000
Senior Notes [Abstract]
Long-term debt											$ 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]
Long-term debt										$ 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]
Long-term Debt					$ 350,000,000	$ 0
Term Loan [Abstract]
Term Loan, Face Amount		350,000,000
Senior Notes [Abstract]
Long-term debt		$ 350,000,000
Interest rate		5.625%			5.625%