Summary of Significant Accounting Policies (Accounts Receivable) (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 4,664	$ 5,584	$ 6,319
Charged to expense	4,392	2,024	2,284
Write-offs, recoveries and other	(3,647)	(2,944)	(3,019)
Balance at end of year	$ 5,409	$ 4,664	$ 5,584