The amount of the original debt being exchanged in a noncash transaction.

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Debt Instrument, Covenant, Capitalization Ratio, Maximum allowed (as a percent)

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Debt Instrument, Covenant, Consolidated Net Worth minimum allowed

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The average effective interest rate during the reporting period, which includes the expected patronage credits.

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Amount of equal principal balance installment payments due each year of the six, seven, eight, and ninth anniversaries of the Closing Date.

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Note issuance price as a percentage of their principal amount.

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Percentage of the outstanding Senior Notes that were tendered and accepted for exchange upon closing of the related exchange offers.

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Threshold of amount of capital expenditures made during four consecutive quarters, maximum

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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The average effective interest rate during the reporting period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Net amount of long-term deferred finance costs capitalized at the end of the reporting period.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt (Details) - USD ($)			3 Months Ended
Debt (Details) - USD ($)	Nov. 26, 2013	May. 08, 2013	Mar. 31, 2016	Mar. 31, 2015	Mar. 30, 2016	Dec. 31, 2015	May. 15, 2015	Aug. 15, 2013	Oct. 22, 2012
Debt [Line Items]
Long-term debt			$ 474,356,000			$ 344,589,000
Deferred financing costs			(6,794,000)			(6,616,000)
Senior Notes [Abstract]
Interest paid			600,000	$ 300,000
Medium-term notes [Member] \| Term Loan Due 2026 [Member]
Debt [Line Items]
Long-term debt			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
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, Interest Rate During Period			2.32%
Term Loan, 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] \| 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%
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, Interest Rate During Period			2.18%
Term Loan, Interest Rate During Period With Patronage Credits			1.40%
Senior Notes [Abstract]
Senior Notes, Face Amount							$ 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%
Senior notes [Member] \| 6.375% Senior Notes Due 2020 [Member]
Debt [Line Items]
Long-term debt			$ 299,990,000			299,990,000
Unamortized premium on 6.375% senior notes			$ 1,160,000			$ 1,215,000
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]
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%