Bank Credit Agreements and Other Short-Term and Long-Term Debt (Long Term Debt) (Details) In Thousands, unless otherwise specified			12 Months Ended			12 Months Ended		12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2012 Notes Payable To Bank 1 [Member] USD ($)	Dec. 31, 2012 Notes Payable To Bank 1 [Member] TWD	Dec. 31, 2011 Notes Payable To Bank 1 [Member] USD ($)	Dec. 31, 2012 Notes Payable To Bank 2 [Member] USD ($)	Dec. 31, 2011 Notes Payable To Bank 2 [Member] USD ($)	Dec. 31, 2012 Term Loan [Member] USD ($)	Dec. 31, 2011 Term Loan [Member] USD ($)
Long-term debt by current and noncurrent [Abstract]
Total long-term debt	$ 45,194	$ 3,265
Current portion of long-term debt	(1,063)	(408)
Long-term borrowings	44,131	2,857
Debt Instrument [Line Items]
Debt Instrument, Issuance Date								February 1, 2012
Debt Instrument, Interest Rate Terms								bears interest at a rate per annum equal to the Eurocurrency Rate plus 1.25% per annum
Long-term Debt, Gross			$ 2,979	158,000	$ 3,265	$ 2,215	$ 0	$ 40,000	$ 0
Long-term variable interest rate			3.30%	3.30%	2.00%	2.50%
Debt Instrument, Maturity Date, Description			TWD 132 million matures on July 6, 2021, and TWD 26 million matures July 6, 2013	TWD 132 million matures on July 6, 2021, and TWD 26 million matures July 6, 2013		Maturity dates range from 2013 to 2023		Term Loan matures on January 17, 2015