Property, Plant and Equipment (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Dec. 31, 2012	Dec. 31, 2011	Jan. 02, 2011
Property, Plant and Equipment [Abstract]
Depreciation of property, plant and equipment	$ 79,880	$ 63,739	$ 62,749	$ 62,275	$ 62,932	$ 61,589	$ 62,615	$ 61,929	$ 268,643	$ 249,065	$ 242,405