Other Comprehensive Income Components of Other Comprehensive Income (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		$ 7,500,000		$ 7,500,000
Net earnings	37,163,000	31,045,000	63,065,000	53,140,000
Currency Translation Adjustment	(3,281,000)	(7,527,000)		(1,542,000)
Pension liability adjustment, net of tax	74,000	169,000		141,000
Unrealized gain on interest rate swaps, net of tax	1,218,000	(95,000)	912,000	(53,000)
Comprehensive income	$ 35,174,000	$ 23,592,000	$ 56,252,000	$ 51,686,000