Net Income per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Reconciliation of Net Income per Common Share [Line Items]
Net income	$ 8,481	$ 9,926	$ 25,473	$ 33,397
Basic weighted-average shares outstanding	53,648,000	55,029,000	53,880,000	55,062,000
Diluted weighted-average shares outstanding	54,324,000	55,987,000	54,570,000	56,101,000
Net income per share – basic (in USD per share)	$ 0.16	$ 0.18	$ 0.47	$ 0.61
Net income per share – diluted (in USD per share)	$ 0.16	$ 0.18	$ 0.47	$ 0.60
Stock Options [Member]
Reconciliation of Net Income per Common Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	800,000	1,300,000	900,000	1,300,000
Stock Options [Member]
Reconciliation of Net Income per Common Share [Line Items]
Effect of dilutive securities	365,000	539,000	359,000	613,000
Restricted Stock [Member]
Reconciliation of Net Income per Common Share [Line Items]
Effect of dilutive securities	311,000	419,000	331,000	426,000