Fair Value Measurements (Details) (USD $)									3 Months Ended		6 Months Ended
	Jun. 28, 2013	Dec. 31, 2012	Jun. 28, 2013 Senior notes Senior Secured Notes (9.50%)	Dec. 31, 2012 Senior notes Senior Secured Notes (9.50%)	Jun. 28, 2013 Fair Value, Inputs, Level 2 Senior notes Senior Secured Notes (9.50%)	Dec. 31, 2012 Fair Value, Inputs, Level 2 Senior notes Senior Secured Notes (9.50%)	Jun. 28, 2013 Accrued Liabilities Forward Contracts Fair Value, Inputs, Level 2	Dec. 31, 2012 Accrued Liabilities Forward Contracts Fair Value, Inputs, Level 2	Jun. 28, 2013 Other Nonoperating Income (Expense) Forward Contracts	Jun. 29, 2012 Other Nonoperating Income (Expense) Forward Contracts	Jun. 28, 2013 Other Nonoperating Income (Expense) Forward Contracts	Jun. 29, 2012 Other Nonoperating Income (Expense) Forward Contracts
Derivatives, Fair Value [Line Items]
Derivative instruments not designated as hedging instruments, loss									$ (100,000)
Derivative instruments not designated as hedging instruments, gain										300,000	200,000	100,000
Derivative instruments not designated as hedging instruments, liability, at fair value							(200,000)	(200,000)
Long-term debt	543,202,000	516,674,000	375,000,000	375,000,000
Fair value of long-term debt					$ 356,300,000	$ 348,800,000