Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																																12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Carrying Value U.S. Credit Facility	Dec. 31, 2012 Carrying Value U.S. Credit Facility	Mar. 31, 2013 Carrying Value Japanese working capital loan	Dec. 31, 2012 Carrying Value Japanese working capital loan	Mar. 31, 2013 Carrying Value Chinese Credit Facility	Mar. 31, 2013 Carrying Value Other loans	Dec. 31, 2012 Carrying Value Other loans	Dec. 31, 2012 Carrying Value Japanese term loan	Mar. 31, 2013 Total Fair Value U.S. Credit Facility	Dec. 31, 2012 Total Fair Value U.S. Credit Facility	Mar. 31, 2013 Total Fair Value Japanese working capital loan	Dec. 31, 2012 Total Fair Value Japanese working capital loan	Mar. 31, 2013 Total Fair Value Chinese Credit Facility	Mar. 31, 2013 Total Fair Value Other loans	Dec. 31, 2012 Total Fair Value Other loans	Dec. 31, 2012 Total Fair Value Japanese term loan	Mar. 31, 2013 Level 2 U.S. Credit Facility	Dec. 31, 2012 Level 2 U.S. Credit Facility	Mar. 31, 2013 Level 2 Japanese working capital loan	Dec. 31, 2012 Level 2 Japanese working capital loan	Mar. 31, 2013 Level 2 Chinese Credit Facility	Mar. 31, 2013 Level 2 Other loans	Dec. 31, 2012 Level 2 Other loans	Dec. 31, 2012 Level 2 Japanese term loan	Mar. 31, 2013 Recurring Carrying Value	Dec. 31, 2012 Recurring Carrying Value	Mar. 31, 2013 Recurring Total Fair Value	Dec. 31, 2012 Recurring Total Fair Value	Mar. 31, 2013 Recurring Level 2	Dec. 31, 2012 Recurring Level 2	Dec. 31, 2012 Nonrecurring Level 3	Dec. 31, 2012 Nonrecurring Level 3 Carrying Value
Fair Value Measurement
Derivative assets	$ 1,606	$ 1,120																									$ 1,606	$ 1,120	$ 1,606	$ 1,120	$ 1,606	$ 1,120
Derivative liabilities																											(190)	(646)	(190)	(646)	(190)	(646)
Acquisition earn-out liability																											(1,423)	(1,300)	(1,423)	(1,300)	(1,423)	(1,300)
Debt instrument			(47,900)	(44,250)	(15,934)	(18,611)	(173)	(153)	(158)	(954)	(47,900)	(44,250)	(15,934)	(18,611)	(173)	(153)	(158)	(954)	(47,900)	(44,250)	(15,934)	(18,611)	(173)	(153)	(158)	(954)
Long-lived assets	262,078	262,993																															700	4,700
Restructuing charges	(24)																																4,000
Derivative liabilities	$ (83)	$ (360)