Bank Credit Agreements and Other Short-Term and Long-Term Debt - Schedule of Debt (Parenthetical) (Details) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended
	Dec. 31, 2014 Notes Payable To Bank 1 USD ($)	Dec. 31, 2014 Notes Payable To Bank 1 TWD	Dec. 31, 2013 Notes Payable To Bank 1 USD ($)	Dec. 31, 2014 Notes Payable To Bank 1 Note 1	Dec. 31, 2013 Notes Payable To Bank 1 Note 1	Dec. 31, 2014 Notes Payable To Bank 2	Dec. 31, 2013 Notes Payable To Bank 2 USD ($)	Dec. 31, 2014 Minimum Notes Payable To Bank 1 Note 1	Dec. 31, 2013 Minimum Notes Payable To Bank 1 Note 2	Dec. 31, 2014 Minimum Notes Payable To Bank 2 Note 2	Dec. 31, 2014 Maximum Notes Payable To Bank 1 Note 1	Dec. 31, 2013 Maximum Notes Payable To Bank 1 Note 2	Dec. 31, 2014 Maximum Notes Payable To Bank 2 Note 2
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 2,074	158,000	$ 2,500				$ 2,426
Long-term variable interest rate				2.00%	2.10%				1.80%			2.50%
Debt Instrument, Maturity Date, Description	TWD 132 million matures on July 6, 2021, and TWD 26 million matured July 6, 2013	TWD 132 million matures on July 6, 2021, and TWD 26 million matured July 6, 2013				maturity dates range from 2013 to 2023
Debt instrument, maturity date								Jul. 06, 2013			Jul. 06, 2021
Debt instrument, maturity year										2013			2023