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Debt (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Short-term debt $ 12,168 $ 39,181
Long-term debt:    
Long-term debt 210,128 227,957
Less: current portion (28,214) (44,246)
Long-term debt 181,914 183,711
Senior Notes [Member]
    
Long-term debt:    
Long-term debt 174,099 [1] 172,271 [1]
Long-term Debt, Weighted Average Interest Rate 9.50% [1]  
Debt, Maturity Oct - 2017 [1]  
Pst Notes Payable [Member]
    
Short-term debt 22,584 38,296
Long-term debt:    
Long-term debt 11,513 15,697
Debt Instrument Maturity Period Range Start 2013  
Debt Instrument Maturity Period Range End 2019  
Pst Notes Payable [Member] | Minimum [Member]
    
Long-term debt:    
Short-term debt, Weighted Average Interest as of September 30, 2012 3.65%  
Long-term Debt, Weighted Average Interest Rate 4.00%  
Pst Notes Payable [Member] | Maximum [Member]
    
Long-term debt:    
Short-term debt, Weighted Average Interest as of September 30, 2012 4.99%  
Long-term Debt, Weighted Average Interest Rate 4.50%  
Suzhou Long Term Note [Member]
    
Long-term debt:    
Long-term debt 1,432 1,430
Long-term Debt, Weighted Average Interest Rate 7.50%  
Debt, Maturity Aug - 2013  
Other [Member]
    
Long-term debt:    
Other Long-term debt 500 263
Letter Of Credit [Member]
    
Short-term debt 11,000 38,000
Long-term debt:    
Short-term debt, Weighted Average Interest as of September 30, 2012 1.64%  
Debt, Maturity within 1 year  
Bcs Revolver [Member]
    
Short-term debt $ 1,168 $ 1,181
Long-term debt:    
Short-term debt, Weighted Average Interest as of September 30, 2012 5.75%  
Debt, Maturity Sept - 2013  
Pst Term Loans [Member]
    
Long-term debt:    
Debt, Maturity Various 2012 - 2013  
[1] Weighted average interest rate excludes the impact of the Company's interest rate swap and the accretion of debt discount.