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Debt (Narrative) (Details)
6 Months Ended 12 Months Ended 18 Months Ended 3 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2014
People's Bank of China One-Year Lending Rate [Member]
Jun. 30, 2014
Maximum [Member]
London Interbank Offered Rate (LIBOR) [Member]
Jun. 30, 2014
Minimum [Member]
London Interbank Offered Rate (LIBOR) [Member]
Jun. 30, 2014
Senior Notes [Member]
USD ($)
Dec. 31, 2013
Senior Notes [Member]
USD ($)
Oct. 04, 2010
Senior Notes [Member]
Jun. 30, 2014
Senior Notes [Member]
Annual Payment [Member]
Jun. 30, 2014
Senior Notes [Member]
Maximum [Member]
Annual Payment [Member]
Jun. 30, 2014
Revolving Credit Facility [Member]
USD ($)
Jun. 30, 2014
Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2013
Revolving Credit Facility [Member]
USD ($)
Nov. 02, 2007
Revolving Credit Facility [Member]
USD ($)
Jun. 30, 2014
Revolving Credit Facility [Member]
Federal Funds Rate [Member]
Jun. 30, 2014
Revolving Credit Facility [Member]
Maximum [Member]
Federal Funds Rate [Member]
Jun. 30, 2014
Revolving Credit Facility [Member]
Minimum [Member]
USD ($)
Jun. 30, 2014
Revolving Credit Facility [Member]
Minimum [Member]
Federal Funds Rate [Member]
Jun. 30, 2014
Line of Credit [Member]
USD ($)
Jun. 30, 2014
Line of Credit [Member]
SEK
Dec. 31, 2013
Line of Credit [Member]
USD ($)
Jun. 30, 2014
Term Loan [Member]
USD ($)
Feb. 25, 2014
Term Loan [Member]
CNY
Dec. 31, 2013
Term Loan [Member]
USD ($)
Jun. 30, 2014
Term Loan One [Member]
USD ($)
Dec. 31, 2013
Term Loan One [Member]
USD ($)
Aug. 21, 2013
Term Loan One [Member]
CNY
Jun. 30, 2014
Term Loan One [Member]
People's Bank of China One-Year Lending Rate [Member]
Jun. 30, 2014
PST Eletronicaltda [Member]
Jun. 30, 2014
PST Eletronicaltda [Member]
Term Loan [Member]
USD ($)
Debt Instrument [Line Items]                                                              
Credit Facility covenat compliance The Company was in compliance with all Credit Facility covenants at June 30, 2014 and December 31, 2013 The Company was in compliance with all Credit Facility covenants at June 30, 2014 and December 31, 2013                                                          
Notes covenant compliance     The Company was in compliance with all note covenants at June 30, 2014 and December 31, 2013.                                                        
Debt, description of variable rate basis                         Interest is payable quarterly at either (i) the higher of the prime rate or the Federal Funds rate plus 0.50%, plus a margin of 0.00% to 0.25% or (ii) LIBOR plus a margin of 1.00% to 1.75%, depending upon the Company's undrawn availability, as defined.                                    
Debt interest rate       7.39%                                                      
Debt instrument, maturity date             Oct. 15, 2017                                                
Debt instrument, unamortized discount, percentage                 2.50%                                            
Credit facility, commitment fee percentage                       0.375%                                      
Line of credit facility, maximum borrowing capacity                             $ 100,000,000         $ 2,992,000 20,000,000 $ 3,107,000                  
Credit facility, borrowing capacity                       85,446,000 85,446,000 71,072,000                                  
Borrowings outstanding                                                                 
Basis spread on variable rate         1.75% 1.00%                   0.50% 0.25%   0.00%                        
Interest rate multiplier                                                         132.00%    
Line of credit, current                                             0   0            
Face value of senior secured notes             175,000,000 175,000,000                                              
Line of credit facility covenant limits                                   20,000,000                          
Credit facility, capacity restrictions of investment activities                       15,000,000 15,000,000                                    
Note redeemable start date             Oct. 15, 2014                                                
Percentage of outstanding debt redeemed                     10.00%                                        
Debt early redemption premium             104.75%     103.00%                                          
Unamortized discount             2,428,000 2,732,000                                              
Debt, face amount                                               9,000,000       9,000,000      
Debt outstanding                                                   1,451,000 1,487,000        
Credit facilities                                                                 
Total long-term debt, net 182,889,000 185,045,000 182,889,000                                                        
Less: current portion 22,213,000 12,187,000 22,213,000                                                        
2014                                                             19,539,000
2015                                                             3,595,000
2016                                                             2,359,000
2017                                                             1,168,000
2018                                                             1,124,000
2019                                                             $ 1,124,000
Long-term debt, weighted average interest rate             9.50% [1]                                             4.90%  
Short-term debt, weighted average interest rate                                                           9.90%  
[1] Interest rate excludes the effect of the Company's interest rate swap and the accretion of debt discount.