Supplemental Balance Sheet Information (Long-lived Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Dec. 31, 2011
Net property, plant and equipment
Gross property, plant and equipment	$ 1,297,861		$ 1,294,675
Less accumulated depreciation	(570,456)		(556,645)
Net property, plant and equipment	727,405		738,030
Depreciation expense	31,161	31,904
Land [Member]
Net property, plant and equipment
Gross property, plant and equipment	40,482		40,517
Buildings [Member]
Net property, plant and equipment
Gross property, plant and equipment	699,041		696,275
Machinery and Equipment [Member]
Net property, plant and equipment
Gross property, plant and equipment	337,820		332,683
Leashold Improvements [Member]
Net property, plant and equipment
Gross property, plant and equipment	38,689		29,975
Furniture and Fixtures [Member]
Net property, plant and equipment
Gross property, plant and equipment	27,932		26,775
Vehicles [Member]
Net property, plant and equipment
Gross property, plant and equipment	3,140		5,226
Computer Hardware and Software [Member]
Net property, plant and equipment
Gross property, plant and equipment	104,959		105,563
Construction in Progress [Member]
Net property, plant and equipment
Gross property, plant and equipment	$ 45,798		$ 57,661