Debt (Deferred Financing Fees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 28, 2018	Dec. 29, 2017
Deferred Finance Costs [Roll Forward]
Total, Beginning Balance	$ 16,466
Total, Amortization during the period	(7,772)	$ (49,110)	$ (10,911)
Total, Ending Balance	10,702	16,466
Revolving Credit Facility [Member]
Deferred Finance Costs [Roll Forward]
Debt issuance costs, Beginning Balance	1,817	2,808
Debt issuance costs, Financing costs incurred	302
Debt issuance costs, Write off of debt issuance costs and unamortized discount	(150)
Debt issuance costs, Amortization during the period	(939)	(991)
Debt issuance costs, Ending Balance	1,030	1,817	2,808
Term Loan And Senior Notes [Member]
Deferred Finance Costs [Roll Forward]
Debt issuance costs, Beginning Balance	12,713	26,889
Debt issuance costs, Financing costs incurred	919
Debt issuance costs, Write off of debt issuance costs and unamortized discount	(1,913)	(9,757)
Debt issuance costs, Amortization during the period	(3,440)	(4,419)
Debt issuance costs, Ending Balance	8,279	12,713	26,889
Total, Beginning Balance	16,466	33,278
Total, Financing costs incurred	919
Total, Write-off during the period	(2,395)	(11,367)
Total, Amortization during the period	(4,288)	(5,445)
Total, Ending Balance	10,702	16,466	33,278
Term Loan B (TLB) Facility [Member]
Deferred Finance Costs [Roll Forward]
Unamortized discount on TLB Facility, Beginning Balance	3,753	6,389
Unamortized discount on TLB Facility, Financing costs incurred	0
Unamortized discount on TLB Facility, Write-off during the period	(482)	(1,610)
Unamortized discount on TLB Facility, Amortization during the period	(848)	(1,026)
Unamortized discount on TLB Facility, Ending Balance	$ 2,423	$ 3,753	$ 6,389