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Share-Based Compensation (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses $ 9,673 $ 8,222 $ 7,063
Restricted Stock Units (Rsus) [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses 9,653 8,195 6,773
Cost of Revenues [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses 235 176 124
Cost of Revenues [Member] | Restricted Stock Units (Rsus) [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses 235 176 124
Research and Development [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses 6,705 5,625 5,062
Research and Development [Member] | Restricted Stock Units (Rsus) [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses 6,686 5,605 4,790
General and administrative [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses 1,308 1,191 872
General and administrative [Member] | Restricted Stock Units (Rsus) [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses 1,307 1,184 863
Selling and Marketing Expense [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses 1,425 1,230 1,005
Selling and Marketing Expense [Member] | Restricted Stock Units (Rsus) [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses 1,425 1,230 996
Income Tax Benefit [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses 2,170 1,886 818
Income Tax Benefit [Member] | Restricted Stock Units (Rsus) [Member]
     
Long Term Incentive Plan [Line Items]      
Share-based compensation expenses $ 2,170 $ 1,886 $ 818