Significant Accounting Policies (Summary Of Activity In The Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 13,135	$ 12,593	$ 11,412
Charged to Costs and Expenses	7,804	3,916	7,986
Write-offs, Net of Recoveries	(6,306)	(3,374)	(6,805)
Balance at End of Period	14,633	13,135	12,593
Trade Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	5,324	5,547	6,230
Charged to Costs and Expenses	4,503	1,395	3,801
Write-offs, Net of Recoveries	(3,236)	(1,618)	(4,484)
Balance at End of Period	6,591	5,324	5,547
Other Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	7,499	6,727	4,866
Charged to Costs and Expenses	3,293	2,516	4,182
Write-offs, Net of Recoveries	(3,024)	(1,744)	(2,321)
Balance at End of Period	7,768	7,499	6,727
Other Non-Current Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	312	319	316
Charged to Costs and Expenses	8	5	3
Write-offs, Net of Recoveries	(46)	(12)
Balance at End of Period	$ 274	$ 312	$ 319