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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Investments in Non-marketable Equity Securities $ 21,877 $ 12,688  
Impairment loss on investment 0 1,299 0
Eturbotouch Technology Inc [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Investments in Non-marketable Equity Securities   477  
Impairment loss on investment   238  
Fair Value, Inputs, Level 1 [Member] | Eturbotouch Technology Inc [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Investments in Non-marketable Equity Securities   0  
Fair Value, Inputs, Level 2 [Member] | Eturbotouch Technology Inc [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Investments in Non-marketable Equity Securities   0  
Fair Value, Inputs, Level 3 [Member] | Eturbotouch Technology Inc [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Investments in Non-marketable Equity Securities   $ 477