Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014 stock_plan		Jun. 29, 2013
Number of stock plans approved by shareholders			2
Total stock-based compensation expense(1)	$ 2,143,000	$ 1,560,000	$ 2,035,000	[1]	$ 1,992,000
Income tax benefit	(722,000)	(537,000)	(696,000)		(685,000)
Total stock-based compensation expense, net of tax	1,421,000	1,023,000	1,339,000		1,307,000
Employee Service Share-based Compensation, Expense (Benefit) of Change in Forfeiture Rate			(1,200,000)
Stock Options [Member]
Total stock-based compensation expense(1)	694,000	732,000	929,000		1,277,000
Time-Based Stock Awards And Performance Stock Awards [Member]
Total stock-based compensation expense(1)	$ 1,449,000	$ 828,000	$ 1,106,000		$ 715,000

[1] The six months ended June 28, 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.