Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015	Mar. 31, 2016	Jan. 02, 2016
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ (7,264)		$ (7,264)			$ (5,186)
Cash dividends per common share (in dollars per share)	$ 0.275	$ 0.265	$ 0.54	$ 0.515
Common Stock [Member]
Class of Stock [Line Items]
Repurchased common stock, shares			208,000
Repurchased common stock, value			$ 8,700
Stock repurchase program, remaining authorized repurchase amount	$ 184,000		184,000
Interest Rate Swap [Member]
Class of Stock [Line Items]
Derivative, notional amount					$ 150,000
Derivative, fixed interest rate					1.29%
Derivative liability	2,500		2,500
Accumulated other comprehensive income (loss)	$ 1,600		$ 1,600