Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands			1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 10, 2015	Mar. 05, 2015	Jul. 31, 2015	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued customer incentives and rebates				$ 11,700,000		$ 11,700,000		$ 12,500,000
Cash dividend declared (USD per share)		$ 0.5		$ 0	$ 0	$ 0.50	$ 0
Dividend paid	$ 21,000,000					$ 20,980,000	$ 0
Stock repurchase program, authorized amount			$ 30,000,000
Stock repurchase program, period in which shares may be repurchased			2 years
Repurchase of common stock (shares)						439
Treasury stock acquired, average cost per share (USD per share)						$ 7.75
Repurchase of common stock						$ 3,410,000
Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash portion of the dividend	$ 400,000