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Fair Value Measurements (Outstanding Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 01, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value $ 557,500 $ 565,125
Fair Value, Measurements, Recurring | Level 2 Inputs
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instruments at fair value 585,528 599,685
Fair Value, Measurements, Recurring | Level 2 Inputs | Term Loan
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instruments at fair value 367,978 372,285
Fair Value, Measurements, Recurring | Level 2 Inputs | Senior Notes
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instruments at fair value 217,550 220,400
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