Credit Facility and Long-Term Debt (Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 27, 2015	Mar. 28, 2014
Debt Disclosure [Abstract]
Contractual coupon interest	$ 9,538	$ 9,652
Amortization of debt issuance costs	456us-gaap_AmortizationOfFinancingCosts	456us-gaap_AmortizationOfFinancingCosts
Amortization of Debt Discount, Net	323	323
Total Interest Expense related to senior notes	$ 10,317us-gaap_InterestExpenseDebt	$ 10,431us-gaap_InterestExpenseDebt

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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- Definition

Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 225

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- Definition

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

+ References

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-Name Regulation S-X (SX)

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