Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014 stock_plan		Sep. 28, 2013
Number of stock plans approved by shareholders			2
Total stock-based compensation expense	$ 2,259,000	$ 1,066,000	$ 4,294,000	[1]	$ 3,058,000
Income tax benefit	(768,000)	(366,000)	(1,464,000)		(1,049,000)
Total stock-based compensation expense, net of tax	1,491,000	700,000	2,830,000		2,009,000
Employee Service Share-based Compensation, Expense (Benefit) of Change in Forfeiture Rate			(1,200,000)
Stock Options [Member]
Total stock-based compensation expense	574,000	740,000	1,503,000		2,018,000
Time-Based Stock Awards And Performance Stock Awards [Member]
Total stock-based compensation expense	$ 1,685,000	$ 326,000	$ 2,791,000		$ 1,040,000

[1] The nine months ended September 27, 2014 includes a $1.2 million benefit related to a change in estimated forfeitures due to employee turnover during the three months ended March 29, 2014.