Debt (Schedule of Deferred Financing Fees) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 29, 2017	Sep. 29, 2017	Sep. 30, 2016
Deferred Finance Costs [Roll Forward]
Total, Beginning Balance		$ 40,837
Amortization during the period		(8,850)	$ (5,387)
Total, Ending Balance	$ 34,520	34,520
Loss on extinguishment of debt	800	3,300
Revolving Credit Facility [Member]
Deferred Finance Costs [Roll Forward]
Deferred Finance Costs, Net, Beginning Balance		3,800
Amortization during the period		(744)
Deferred Finance Costs, Net, Ending Balance	3,056	3,056
Term Loan And Senior Notes [Member]
Deferred Finance Costs [Roll Forward]
Deferred Finance Costs, Net, Beginning Balance		32,096
Financing costs deferred		1,789
Write-off of debt issuance costs and unamortized discount		(2,244)
Amortization during the period		(3,878)
Deferred Finance Costs, Net, Ending Balance	27,763	27,763
Total, Beginning Balance		40,837
Financing costs incurred		1,789
Write-off of debt issuance costs and unamortized discount		(3,272)
Amortization during the period		(4,834)
Total, Ending Balance	34,520	34,520
Term Loan B (TLB) Facility [Member]
Deferred Finance Costs [Roll Forward]
Unamortized Discount on TLB Facility, Beginning Balance		8,741
Financing costs incurred		0
Write-off of debt issuance costs and unamortized discount		(1,028)
Amortization during the period		(956)
Unamortized Discount on TLB Facility, Ending Balance	$ 6,757	$ 6,757