Summary Of Significant Accounting Policies (Components of Other Comprehensive Income (Loss)) (Details) $ in Thousands	6 Months Ended
	Jun. 28, 2015 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 28, 2014	$ (34,684)
Foreign currency translation adjustment	(10,987)
Amounts reclassified from other comprehensive income	1,061
Net other comprehensive income (loss)	(9,926)
Balance, June 28, 2015	(44,610)
Pension plan
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 28, 2014	(35,036)
Foreign currency translation adjustment	2,881
Amounts reclassified from other comprehensive income	1,061
Net other comprehensive income (loss)	3,942
Balance, June 28, 2015	(31,094)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 28, 2014	352
Foreign currency translation adjustment	(13,868)
Amounts reclassified from other comprehensive income	0
Net other comprehensive income (loss)	(13,868)
Balance, June 28, 2015	$ (13,516)