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Debt (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Short-term debt $ 1,160 $ 39,181
Debt:    
Long-term debt 201,321 227,957
Less: current portion (18,925) (44,246)
Total long-term debt, net 181,311 183,711
Letter Of Credit [Member]
    
Short-term debt 0 38,000
Debt:    
Debt, Maturity within 1 year  
Bcs Revolver [Member]
    
Short-term debt 1,160 1,181
Debt:    
Debt, Maturity Sept - 2013  
Short-term debt, Weighted Average Interest as of September 30, 2012 5.25%  
Senior Notes [Member]
    
Debt:    
Long-term debt 173,916 [1] 172,271 [1]
Debt, Maturity Oct - 2017 [1]  
Long-term Debt, Weighted Average Interest Rate 9.50% [1]  
Pst Notes Payable [Member]
    
Short-term debt 16,161 38,296
Debt:    
Long-term debt 8,155 15,697
Debt, Maturity Various 2013  
Long-term Debt, Weighted Average Interest Rate 4.00%  
Debt Instrument Maturity Period Range Start 2013  
Debt Instrument Maturity Period Range End 2019  
Pst Notes Payable [Member] | Maximum [Member]
    
Debt:    
Short-term debt, Weighted Average Interest as of September 30, 2012 15.60%  
Pst Notes Payable [Member] | Minimum [Member]
    
Debt:    
Short-term debt, Weighted Average Interest as of September 30, 2012 3.65%  
Other [Member]
    
Debt:    
Long-term debt 559 263
Suzhou Long Term Note [Member]
    
Debt:    
Long-term debt $ 1,445 $ 1,430
Debt, Maturity Aug - 2013  
Long-term Debt, Weighted Average Interest Rate 7.50%  
[1] Weighted average interest rate excludes the impact of the Company's interest rate swap and the accretion of debt discount.