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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Short-term debt $ 0 $ 1,160
Debt:    
Long-term debt 211,152 200,236
Less: current portion (17,621) (18,925)
Total long-term debt, net 193,531 181,311
Long-term Debt, Weighted Average Interest Rate 9.50%  
Letter Of Credit [Member]
    
Short-term debt 0 0
Debt:    
Debt, Maturity Dec-2016  
Bcs Revolver [Member]
    
Short-term debt 0 1,160
Debt:    
Debt, Maturity Feb-2013  
Senior Notes [Member]
    
Debt:    
Long-term debt 173,948 [1] 173,916 [1]
Debt, Maturity Oct-2017 [1]  
Long-term Debt, Weighted Average Interest Rate 9.50% [1]  
Pst Notes Payable [Member]
    
Short-term debt 14,518 16,161
Debt:    
Long-term debt 20,701 8,155
Debt, Maturity Various 2013  
Debt Instrument Maturity Period Range Start 2016  
Debt Instrument Maturity Period Range End 2019  
Pst Notes Payable [Member] | Maximum [Member]
    
Debt:    
Long-term Debt, Weighted Average Interest Rate 5.50%  
Short-term debt, Weighted Average Interest Rate 3.62%  
Pst Notes Payable [Member] | Minimum [Member]
    
Debt:    
Long-term Debt, Weighted Average Interest Rate 4.00%  
Short-term debt, Weighted Average Interest Rate 2.32%  
Other [Member]
    
Debt:    
Long-term debt 536 559
Suzhou Long Term Note [Member]
    
Debt:    
Long-term debt $ 1,449 $ 1,445
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.