Basis of Presentation Accounting Changes (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	$ 290,151	$ 278,566	$ 572,805	$ 551,760
Gross Profit	115,329	106,520	221,397	211,149
Selling, general and administrative expenses	86,838	82,407	175,750	162,475
Operating Income (Loss)	28,499	24,079	45,679	48,638
Earnings before income taxes	25,584	21,283	40,132	43,161
Income tax expense	9,105	7,256	14,250	14,942
Net earnings	16,479	14,027	25,882	28,219
Pension plan adjustments, net of tax	1,362	388	2,723	942
Basic net earnings per share	$ 0.62	$ 0.53	$ 0.98	$ 1.08
Diluted net earnings per share	$ 0.62	$ 0.53	$ 0.98	$ 1.06
Change in pension liabilities			438	(7,642)
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		278,917		552,462
Gross Profit		106,169		210,447
Selling, general and administrative expenses		83,033		163,727
Operating Income (Loss)		23,102		46,684
Earnings before income taxes		20,306		41,207
Income tax expense		6,885		14,200
Net earnings		13,421		27,007
Pension plan adjustments, net of tax		994		2,154
Basic net earnings per share		$ 0.51		$ 1.03
Diluted net earnings per share		$ 0.50		$ 1.02
Change in pension liabilities				(6,430)
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		(351)		(702)
Gross Profit		351		702
Selling, general and administrative expenses		(626)		(1,252)
Operating Income (Loss)		977		1,954
Earnings before income taxes		977		1,954
Income tax expense		371		742
Net earnings		606		1,212
Pension plan adjustments, net of tax		(606)		(1,212)
Basic net earnings per share		$ 0.02		$ 0.05
Diluted net earnings per share		$ 0.03		$ 0.04
Change in pension liabilities				$ (1,212)