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Share-based Compensation (Details)
9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Fair value of each share option award on the date of grant based on weighted-average assumption    
Risk-free interest rate 1.20% 2.10%
Expected term 7 years 8 months 12 days 7 years 3 months 18 days
Expected volatility 53.00% 51.00%
Expected dividend yield 4.71% 3.80%