Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016	Mar. 31, 2016
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ (4,373)		$ (5,000)
Cash dividends per common share (in dollars per share)	$ 0.275	$ 0.265
Common Stock
Class of Stock [Line Items]
Repurchased common stock, shares	234,375	49,400
Repurchased common stock, value	$ 11,700	$ 1,700
Stock repurchase program, remaining authorized repurchase amount	125,200
Interest rate swap
Class of Stock [Line Items]
Derivative, notional amount				$ 150,000
Derivative, fixed interest rate				1.29%
Derivative liability	2,700
Accumulated other comprehensive income (loss)	$ 1,700