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Debt (Details Textual)
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Mar. 31, 2012
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2012
Other current assets [Member]
USD ($)
Dec. 31, 2012
Other long term assets [Member]
USD ($)
Dec. 31, 2012
Term Loan [Member]
Dec. 21, 2011
Term Loan [Member]
USD ($)
Dec. 20, 2011
Term Loan [Member]
USD ($)
Dec. 31, 2012
Revolving Credit Facility [Member]
USD ($)
Dec. 20, 2011
Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2012
Chinese Credit Facility [Member]
USD ($)
Dec. 31, 2011
Chinese Credit Facility [Member]
USD ($)
Dec. 31, 2012
Chinese Credit Facility BOA [Member]
USD ($)
Dec. 31, 2012
Chinese Credit Facility BOA [Member]
CNY
Dec. 31, 2012
Chinese Credit Facility JPM [Member]
USD ($)
Apr. 30, 2012
Chinese Credit Facility JPM [Member]
USD ($)
Apr. 30, 2012
Chinese Credit Facility JPM [Member]
CNY
Dec. 31, 2012
Letter of Credit [Member]
USD ($)
Dec. 31, 2012
Borrowings on same-day notice [Member]
USD ($)
Debt (Textual) [Abstract]                                      
Maximum borrowing limits               $ 600,000,000         $ 30,000,000 189,000,000          
Term loan facility principal amount   380,000,000           400,000,000                      
Period of term loan facility               5 years   5 years                  
Borrowings, maturity date           Dec. 01, 2016     Dec. 01, 2016                    
Borrowing capacity under revolving credit facility                   200,000,000               40,000,000 40,000,000
Borrowings, interest rate basis           2.00%             5.60% 5.60% 5.60%        
Borrowings alternate base rate   0.75%       1.75%             100.00% 100.00% 100.00%        
Revolving Credit Facility borrowings   32,145,000 26,734,000           0       21,800,000   10,300,000        
Deferred financing costs       800,000 1,800,000   3,500,000                        
Short term borrowings outstanding                     32,100,000 16,700,000              
Extended revolving credit facility of Chinese subsidiaries with BOA                         22,000,000 [1] 138,600,000   20,000,000 125,000,000    
Interest rate of Chinese Credit Facility BOA   Chinese Credit Facility—BOA currently bears interest based at 100% of the People’s Bank of China’s base rate and was 5.6% as of December 31, 2012                         Chinese Credit Facility—JPM currently bears interest based at 100% of the People’s Bank of China’s base rate and was 5.6% as of December 31, 2012        
Debt (Additional Textual) [Abstract]                                      
Borrowings, interest rate description   interest at LIBOR plus 175 basis points, or the Eurocurrency Spread, or the alternate base rate (“ABR”) plus 75 basis points                                  
Commitment fee on undrawn amount   0.30%                                  
Term loan principal repayment   1.25%                                  
Term loan first installment   20,000,000                                  
Principal repayment of term loan   2.50%                                  
Revolving Credit facility payments 10,000,000                                    
Total interest and commitments fees   8,700,000 300,000                                
Total amortization expense   $ 889,000 $ 21,000                                
[1] Includes stock-based compensation as follows: