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Debt (Narrative) (Details)
SEK in Thousands, $ in Thousands
6 Months Ended
Oct. 15, 2014
USD ($)
Sep. 02, 2014
USD ($)
Jun. 30, 2015
SEK
Dec. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
Oct. 17, 2014
CNY (¥)
Sep. 12, 2014
USD ($)
Sep. 01, 2014
USD ($)
Feb. 25, 2014
CNY (¥)
Oct. 04, 2010
USD ($)
Nov. 02, 2007
USD ($)
Debt Instrument [Line Items]                      
Credit Facility covenat compliance     The Company was in compliance with all credit facility covenants at June 30, 2015 and December 31, 2014                
Notes covenant compliance     The Company was in compliance with all note covenants at June 30, 2015 and December 31, 2014.                
Borrowings outstanding       $ 100,000 $ 100,000            
Maximum leverage ratio     300.00%   300.00%            
Minimum interest coverage ratio     350.00%   350.00%            
Total long-term debt, net       10,651 $ 7,014            
Less: current portion       19,655 $ 20,618            
Senior Notes [Member]                      
Debt Instrument [Line Items]                      
Write off of deferred financing costs       597              
Debt interest rate                   9.50%  
Debt instrument, maturity date     Oct. 15, 2017                
Face value of senior secured notes               $ 175,000   $ 175,000  
Note redeemable start date     Oct. 15, 2014                
Percentage of outstanding debt redeemed   10.00%                  
Debt early redemption percentage 104.75% 103.00%                  
Debt early redemption premium 104.75%                    
Amortization of debt discount (premium)       2,252              
De-designation date unrecognized gain on interest rate swap       348              
Redemption of notes $ 157,500 $ 17,500                  
Loss on early extinguishment of debt       (10,507)              
Premium paid on extinguishment of debt       8,006              
Revolving Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Debt interest rate     1.84%   1.84%            
Line of credit facility, maximum borrowing capacity             $ 300,000       $ 100,000
Increase in maximum borrowing capacity of credit facility             $ 80,000        
Borrowings outstanding       100,000 $ 100,000            
Line of credit expiration date     Sep. 12, 2019                
Revolving Credit Facility [Member] | Maximum [Member]                      
Debt Instrument [Line Items]                      
Credit facility, commitment fee percentage     0.35%                
Revolving Credit Facility [Member] | Minimum [Member]                      
Debt Instrument [Line Items]                      
Credit facility, commitment fee percentage     0.20%                
Term Loan [Member]                      
Debt Instrument [Line Items]                      
Line of credit, current       0 0            
July 2015 through June 2016         20,087            
Long term debt maturities of princpical in remaining portion of year two         1,768            
2017         2,020            
2018         1,214            
2019         1,214            
2021         382            
2020         $ 416            
Term Loan One [Member]                      
Debt Instrument [Line Items]                      
Debt, face amount | ¥                 ¥ 9,000,000    
Term Loan One [Member] | People's Bank of China One-Year Lending Rate [Member]                      
Debt Instrument [Line Items]                      
Interest rate multiplier     120.00%                
Term Loan Two [Member]                      
Debt Instrument [Line Items]                      
Debt, face amount | ¥           ¥ 9,000,000          
Debt outstanding       1,450              
PST Eletronicaltda [Member]                      
Debt Instrument [Line Items]                      
Long-term debt, weighted average interest rate     7.00%   7.00%            
Short-term debt, weighted average interest rate     16.90%   16.90%            
Electronics [Member] | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity     SEK 20,000 $ 2,562 $ 2,413