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Share-based Compensation (Fair Value of Share Options, Valuation Assumptions) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate, minimum 2.83% 2.74%
Risk-free interest rate, maximum 3.35% 3.88%
Expected life (years) 6 years 4 months 6 days  
Volatility, minimum 46.98% 43.10%
Volatility, maximum 74.00% 57.70%
Dividend yield 0.00% 0.00%
Fair value of underlying ordinary shares at grant date, minimum $ 11.17 $ 5.01
Fair value of underlying ordinary shares at grant date, maximum $ 14.73 $ 14.09
Fair value of the share options at grant date, minimum $ 5.50 $ 2.64
Fair value of the share options at grant date, maximum $ 8.31 $ 8.15
Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life (years)   6 years 4 months 6 days
Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life (years)   5 years 4 months 24 days