Earnings Per Share Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 29, 2016	Sep. 29, 2015	Sep. 26, 2014
Class of Stock [Line Items]
Stock dividend paid to company stockholders				5.00%	5.00%	5.00%
Effect of stock dividend	$ 0	$ 0	$ 0
Increase in number of shares subject to outstanding stock options	5.00%	5.00%	5.00%
Dividend equivalent rights	$ 6,258	$ 5,566	$ 4,612
Tax on payments of dividend equivalent rights	435	211	306
Common Stock
Class of Stock [Line Items]
Effect of stock dividend	$ 609	$ 584	$ 520