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Debt (Schedule of Debt) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Oct. 04, 2010
Debt Instrument [Line Items]        
Revolving credit facility $ 100,000 $ 100,000 $ 100,000  
Debt:        
Total debt 22,895 22,895 30,306  
Less: current portion (17,913) (17,913) (19,655)  
Total long-term debt, net 4,982 4,982 10,651  
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Revolving credit facility $ 100,000 $ 100,000 100,000  
Debt:        
Debt interest rate 2.12% 2.12%    
Debt, maturity   September - 2019    
Senior Notes [Member]        
Debt:        
Debt interest rate       9.50%
PST Short-Term Notes [Member]        
Debt Instrument [Line Items]        
Short-term debt $ 15,632 $ 15,632 11,249  
Debt:        
Debt, maturity   Various 2015 and 2016    
PST Short-Term Notes [Member] | Maximum [Member]        
Debt:        
Interest rate maximum 24.00%      
PST Short-Term Notes [Member] | Minimum [Member]        
Debt:        
Interest rate minimum 5.50%      
PST Long-Term Notes [Member]        
Debt:        
Total long-term debt, net $ 6,810 $ 6,810 16,770  
Debt maturity period range start   2016    
Debt maturity period range end   2021    
PST Long-Term Notes [Member] | Maximum [Member]        
Debt:        
Interest rate maximum 8.00%      
PST Long-Term Notes [Member] | Minimum [Member]        
Debt:        
Interest rate minimum 6.17%      
Other [Member]        
Debt:        
Total debt $ 453 $ 453 837  
Suzhou Note [Member]        
Debt Instrument [Line Items]        
Short-term debt     $ 1,450  
Debt:        
Debt, maturity   April 2015