Summary Of Significant Accounting Policies (Components of Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 29, 2013	$ 2,245
Other comprehensive income before reclassifications	(10,272)
Amounts reclassified from other comprehensive income	1,148
Net other comprehensive income	(9,124)
Balance, September 28, 2014	(6,879)
Pension plan
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 29, 2013	(17,773)
Other comprehensive income before reclassifications	1,346
Amounts reclassified from other comprehensive income	1,148
Net other comprehensive income	2,494
Balance, September 28, 2014	(15,279)
Changes in realized and unrealized gains (losses) on derivative hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 29, 2013	0
Other comprehensive income before reclassifications	0
Amounts reclassified from other comprehensive income	0
Net other comprehensive income	0
Balance, September 28, 2014	0
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 29, 2013	20,018
Other comprehensive income before reclassifications	(11,618)
Amounts reclassified from other comprehensive income	0
Net other comprehensive income	(11,618)
Balance, September 28, 2014	$ 8,400