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Fair Value Measurements (Outstanding Borrowings) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	$ 596,460	$ 565,125
Fair Value, Measurements, Recurring \| Level 2 Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instruments at fair value	621,503	599,685
Fair Value, Measurements, Recurring \| Level 2 Inputs \| Term Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instruments at fair value	404,428	372,285
Fair Value, Measurements, Recurring \| Level 2 Inputs \| Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instruments at fair value	217,075	220,400
Fair Value, Measurements, Recurring \| Level 2 Inputs \| Revolving Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instruments at fair value	$ 0	$ 7,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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