Equity and Stock Based Compensation Plans (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of December 29, 2012	$ 1,272
Other comprehensive income before reclassifications	(1,939)
Amounts reclassified from accumulated other comprehensive income	0
Net current-period other comprehensive income	(1,939)
Balance as of March 30, 2013	(667)
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of December 29, 2012	(179)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive income	0
Net current-period other comprehensive income	0
Balance as of March 30, 2013	(179)
Foreign currency translations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of December 29, 2012	1,453
Other comprehensive income before reclassifications	(1,944)
Amounts reclassified from accumulated other comprehensive income	0
Net current-period other comprehensive income	(1,944)
Balance as of March 30, 2013	(491)
Unrealized gains (losses) on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of December 29, 2012	(2)
Other comprehensive income before reclassifications	5
Amounts reclassified from accumulated other comprehensive income	0
Net current-period other comprehensive income	5
Balance as of March 30, 2013	$ 3