Shareholders' Equity Net Income per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 6,425	$ 20,259	$ 9,926	$ 23,471	$ 12,495	$ 26,209	$ 16,973	$ 22,417	$ 60,081	$ 78,094	$ 60,478
Basic weighted-average shares outstanding									54,866,000	55,516,000	55,081,000
Diluted weighted-average shares outstanding									55,803,000	57,076,000	56,432,000
Net income per share – basic									$ 1.10	$ 1.41	$ 1.10
Net income per share – diluted	$ 0.12	$ 0.36	$ 0.18	$ 0.42	$ 0.22	$ 0.46	$ 0.30	$ 0.39	$ 1.08	$ 1.37	$ 1.07
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									1,288,000	272,000	1,537,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities									554,000	1,059,000	821,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities									383,000	501,000	530,000