Debt Obligations - Debt & Capital Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 25, 2016
Debt Instrument [Line Items]
Principal amount	$ 250,000
Less unamortized discount based on imputed interest rate of 13.0%	6,596
Total option to repurchase ownership interest in headquarters building in 2019	243,404	$ 240,199
Capital lease obligations	6,805	6,779
Total long-term debt and capital lease obligations	250,209	246,978
Option To Repurchase Headquarters Building 2019 [Member]
Debt Instrument [Line Items]
Principal amount	250,000	250,000
Less unamortized discount based on imputed interest rate of 13.0%	$ 6,596	$ 9,801

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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