Debt Obligations - Interest Expense, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 29, 2015	Mar. 30, 2014
Debt Disclosure [Abstract]
Cash interest expense	$ 12,169	$ 13,051
Amortization of debt costs and discount on debt	1,215	1,190
Capitalized interest	(51)	0
Interest income	(1,141)us-gaap_InvestmentIncomeInterest	(940)us-gaap_InvestmentIncomeInterest
Total interest expense, net	$ 12,192us-gaap_InterestIncomeExpenseNet	$ 13,301us-gaap_InterestIncomeExpenseNet

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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- Definition

Amount of interest capitalized, including amount of allowance for funds used during construction.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

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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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The net amount of operating interest income (expense).

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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