Balance Sheet Details (Accumulated other comprehensive income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011
Accumulated other comprehensive income
Foreign Currency Translation Adjustment, Balance as of December 31, 2011	$ 14,580
Foreign Currency Translation Adjustment, Current period change	1,796	(628)	5,529
Foreign Currency Translation Adjustment, Balance as of December 31, 2012	16,376	14,580
Defined Benefit Pension Plan, Balance as of December 31, 2011	(3,950)
Defined Benefit Pension Plan, Current period change	105
Defined Benefit Pension Plan, Balance as of December 31, 2012	(3,845)	(3,950)
Accumulated Other Comprehensive Income, Balance as of December 31, 2011	10,630			10,619	9,846	13,138	12,554	16,993	11,595
Accumulated Other Comprehensive Income, Current period change	1,901	(129)	2,161
Accumulated Other Comprehensive Income, Balance as of December 31, 2012	$ 12,531	$ 10,630		$ 10,619	$ 9,846	$ 13,138	$ 12,554	$ 16,993	$ 11,595