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Retirement Plan (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Description Of Maximum Retirement Benefit The maximum retirement benefit is 45 months of salary.    
Description Of Contribution To Pension Fund The Company contributes an amount equal to 2% of wages and salaries paid every month to the Fund    
Defined Contribution Plan, Percentage Of Contribution, Description The Company is required to make a monthly contribution for full-time employees in the ROC that elected to participate in the Defined Contribution Plan at a rate no less than 6% of the employee's monthly wages to the employees' individual pension fund accounts at the ROC Bureau of Labor Insurance.    
Defined Contribution Plan, Cost Recognized $ 1,844 $ 1,801 $ 1,507
Pension Contributions 130    
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax 1,008 1,241 668
Defined Benefit Plan, Accumulated Benefit Obligation 887 687  
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 33    
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 220    
Subsequent Event [Member]
      
Defined Benefit Plan, Amortization of Net Gains (Losses) 57    
Employee Social Security Plan [Member]
      
Defined Contribution Plan, Cost Recognized 606 517 335
ROC Bureau Of Labor Insurance [Member]
      
Pension Contributions $ 2,139