Net Income per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Reconciliation of Net Income per Common Share [Line Items]
Net income	$ 23,471	$ 22,417
Basic weighted-average shares outstanding	55,095,000	55,640,000
Options	690,000	1,156,000
Restricted shares	466,000	644,000
Diluted weighted-average shares outstanding	56,251,000	57,440,000
Net income per share – basic	$ 0.43	$ 0.40
Net income per share – diluted	$ 0.42	$ 0.39
Stock Options [Member]
Reconciliation of Net Income per Common Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,000,000	200,000