SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 25, 2010		Dec. 26, 2009
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance	$ 5,447		$ 5,947		$ 6,690
Charged to costs and expenses	(229)		4,763		506
Other additions	(2)	[1]	111	[1]	85	[1]
Deductions	3,652		5,374		1,334
Balance	1,564		5,447		5,947
Environmental Reserves [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance	23,902		23,268		23,248
Charged to costs and expenses	392		5,378		1,087
Other additions	0		(6)		5
Deductions	1,402		4,738		1,072
Balance	22,892		23,902		23,268
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance	28,714		33,812		32,624
Charged to costs and expenses	(443)		(5,496)		52
Other additions	1,434	[2]	398		1,136	[2]
Deductions	0		0		0
Balance	$ 29,705		$ 28,714		$ 33,812

[1] Other consists primarily of bad debt recoveries as well as the effect of fluctuating foreign currency exchange rates in all years presented.

[2] Other includes the additions to valuation allowances in which previously unrecorded gross deferred tax assets and valuation allowances were recognized.