Borrowing Arrangements (Details) In Thousands, unless otherwise specified	Mar. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 Borrowings under Japanese Working Capital Loan USD ($)	Dec. 31, 2012 Borrowings under Japanese Working Capital Loan USD ($)	Mar. 31, 2013 Borrowings under China Credit Facility USD ($)	Dec. 31, 2012 Borrowings under Japanese Term Loan USD ($)	Dec. 31, 2012 Borrowings under Japanese Term Loan JPY (¥)
Short-term Debt
Short-term debt	$ 16,107	$ 19,565	$ 15,934	$ 18,611	$ 173	$ 954	¥ 82,000