Commitments and Contingencies (Details) (USD $)	0 Months Ended	12 Months Ended
	Sep. 25, 1996 sites	Dec. 31, 2012	Dec. 30, 2011	Dec. 31, 2010
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013 Minimum operating lease commitments		$ 7,842,000
2014 Minimum operating lease commitments		4,847,000
2015 Minimum operating lease commitments		4,045,000
2016 Minimum operating lease commitments		2,520,000
2017 Minimum operating lease commitments		2,236,000
Thereafter minimum operating lease commitments		16,752,000
Operating Leases, Future Minimum Payments Due		38,242,000
Operating Leases, Rent Expense		11,600,000	12,500,000	14,200,000
Long-term Purchase Commitment, Amount		17,500,000
Number of National Priorities List sites for which the Company is indemnified for substantially all costs related to specifically identified environmental matters	11
Number of National Priorities List sites for which the Company is indemnified for certain potential costs related to specifically identified environmental matters	9
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance, beginning of year		5,050,000	5,561,000	5,242,000
Payments made or service provided		(2,849,000)	(4,340,000)	(3,225,000)
Warranty expense		2,948,000	3,445,000	3,671,000
Foreign currency translation		(51,000)	384,000	(127,000)
Balance, end of year		$ 5,098,000	$ 5,050,000	$ 5,561,000