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Debt (Narrative) (Details)
3 Months Ended 9 Months Ended 21 Months Ended 0 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
People's Bank of China One-Year Lending Rate [Member]
Sep. 02, 2014
Senior Notes [Member]
USD ($)
Sep. 30, 2014
Senior Notes [Member]
USD ($)
Oct. 15, 2014
Senior Notes [Member]
Sep. 01, 2014
Senior Notes [Member]
USD ($)
Dec. 31, 2013
Senior Notes [Member]
USD ($)
Oct. 04, 2010
Senior Notes [Member]
USD ($)
Sep. 30, 2014
Revolving Credit Facility [Member]
USD ($)
Sep. 30, 2014
Revolving Credit Facility [Member]
USD ($)
Sep. 12, 2014
Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2013
Revolving Credit Facility [Member]
USD ($)
Nov. 02, 2007
Revolving Credit Facility [Member]
USD ($)
Sep. 30, 2014
Line of Credit [Member]
USD ($)
Sep. 30, 2014
Line of Credit [Member]
SEK
Dec. 31, 2013
Line of Credit [Member]
USD ($)
Sep. 30, 2014
Term Loan [Member]
USD ($)
Dec. 31, 2013
Term Loan [Member]
USD ($)
Dec. 31, 2013
Term Loan One [Member]
USD ($)
Aug. 21, 2013
Term Loan One [Member]
CNY
Dec. 31, 2013
Term Loan One [Member]
People's Bank of China One-Year Lending Rate [Member]
Sep. 30, 2014
PST Eletronicaltda [Member]
Sep. 30, 2014
PST Eletronicaltda [Member]
Term Loan [Member]
USD ($)
Jul. 01, 2014
PST Eletronicaltda [Member]
Term Loan [Member]
BRL
Oct. 15, 2014
Subsequent Event [Member]
USD ($)
Oct. 15, 2014
Subsequent Event [Member]
Senior Notes [Member]
Oct. 15, 2014
Subsequent Event [Member]
Senior Notes [Member]
USD ($)
Debt Instrument [Line Items]                                                            
Write off of deferred financing costs                         $ 100,000                                  
Capitalized deferred financing costs                       1,499,000 1,499,000                                  
Credit Facility covenat compliance   The Company was in compliance with all credit facility covenants at September 30, 2014 and December 31, 2013                                                        
Notes covenant compliance     The Company was in compliance with all note covenants at September 30, 2014 and December 31, 2013.                                                      
Debt interest rate         7.00%   9.50%                                     8.00%        
Debt instrument, maturity date             Oct. 15, 2017                                              
Debt instrument, unamortized discount, percentage                     2.50%                                      
Line of credit facility, maximum borrowing capacity                           300,000,000   100,000,000 2,773,000 20,000,000 3,107,000                      
Increase in maximum borrowing capacity of credit facility                           80,000,000                                
Borrowings outstanding                                                          100,000,000    
Interest rate multiplier                                               125.00%            
Line of credit, current                                       0 0                  
Face value of senior secured notes             157,500,000   175,000,000 175,000,000 175,000,000                                      
Note redeemable start date             Oct. 15, 2014                                              
Percentage of outstanding debt redeemed           10.00%                                                
Debt Instrument, Redemption Price, Percentage           103.00%                                             104.75% 104.75%
Debt early redemption premium               104.75%                                            
Unamortized discount             2,043,000     2,732,000                                        
Redemption of notes           17,500,000                                               157,500,000
Debt, face amount                                             9,000,000       11,203,000      
Debt outstanding                                           1,487,000       4,637,000        
Line of credit expiration date                       Sep. 12, 2019                                    
Total long-term debt, net 109,352,000 109,352,000 109,352,000 185,045,000                                                    
Less: current portion 73,887,000 73,887,000 73,887,000 12,187,000                                                    
Loss on early extinguishment of debt (920,000) (920,000)       (820,000)                                               (9,700,000)
Premium paid on extinguishment of debt           525,000                                               7,481,000
2014                                       15,474,000                    
2015                                       2,186,000                    
2016                                       4,405,000                    
2017                                       2,383,000                    
2018                                       1,010,000                    
2019                                       $ 1,010,000                    
Long-term debt, weighted average interest rate             9.50% [1]                                   5.70%          
Short-term debt, weighted average interest rate                                                 11.70%          
[1] Interest rate excludes the effect of the Company's interest rate swap and the accretion of debt discount.