Shareholders' Equity Net Income per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 11,287	$ 25,745	$ 1,416	$ 12,969	$ (21,172)	$ 31,854	$ 11,038	$ 28,799	$ 51,417	$ 50,519	$ 67,974
Basic weighted-average shares outstanding									46,154,000	51,252,000	53,452,000
Effect of dilutive securities									748,000	849,000	741,000
Diluted weighted-average shares outstanding									46,902,000	52,101,000	54,193,000
Net income per share – basic									$ 1.11	$ 0.99	$ 1.27
Net income per share – diluted	$ 0.25	$ 0.56	$ 0.03	$ 0.27	$ (0.42)	$ 0.62	$ 0.21	$ 0.54	$ 1.10	$ 0.97	$ 1.25
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									600,000	400,000	800,000