Shareholders' Equity Net Income per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net Income (Loss) Attributable to Parent	$ 12,495	$ 26,209	$ 16,973	$ 22,417	$ 15,370	$ 17,236	$ 11,289	$ 16,583	$ 78,094	$ 60,478	$ 31,568
Weighted Average Number of Shares Outstanding, Basic									55,516,000	55,081,000	54,005,000
Incremental Common Shares Attributable Options									1,059,000	821,000	817,000
Incremental Common Shares Attributable Restricted shares									501,000	530,000	442,000
Weighted Average Number of Shares Outstanding, Diluted									57,076,000	56,432,000	55,264,000
Earnings Per Share, Basic									$ 1.41	$ 1.10	$ 0.58
Net income per share – diluted	$ 0.22	$ 0.46	$ 0.30	$ 0.39	$ 0.27	$ 0.31	$ 0.20	$ 0.30	$ 1.37	$ 1.07	$ 0.57
Potentially Dilutive Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									272,000	1,537,000	2,486,000