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Debt (Narrative) (Details)
SEK in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 15, 2014
USD ($)
Sep. 02, 2014
USD ($)
Oct. 04, 2010
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
SEK
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Oct. 18, 2014
Oct. 17, 2014
CNY (¥)
Sep. 12, 2014
USD ($)
Feb. 25, 2014
CNY (¥)
Nov. 02, 2007
USD ($)
Debt Instrument [Line Items]                              
Borrowings outstanding $ 100,000,000     $ 100,000,000   $ 100,000,000   $ 100,000,000   $ 100,000,000          
Total long-term debt, net       10,651,000   10,651,000   10,651,000   4,458,000          
Less: current portion       19,655,000   19,655,000   19,655,000   13,905,000          
Loss on early extinguishment of debt       (9,687,000) $ (920,000)     (10,607,000)              
2016                   13,905,000          
2017                   1,873,000          
2018                   986,000          
2019                   100,965,000          
2020                   331,000          
Thereafter                   $ 303,000          
Senior Notes [Member]                              
Debt Instrument [Line Items]                              
Write off of deferred financing costs       535,000 295,000                    
Debt interest rate     9.50%                        
Debt instrument, maturity date     Oct. 15, 2017           Oct. 15, 2017            
Debt instrument, unamortized discount, percentage                     2.50%        
Face value of senior secured notes                 $ 175,000,000            
Percentage of outstanding debt redeemed   10.00%                          
Debt early redemption percentage 104.75% 103.00%                          
Amortization of debt discount (premium)       2,019,000                      
De-designation date unrecognized gain on interest rate swap       348,000                      
Redemption of notes $ 157,500,000 $ 17,500,000                          
Debt, face amount     $ 175,000,000                        
Loss on early extinguishment of debt       (9,687,000) (820,000) (10,507,000)                  
Premium paid on extinguishment of debt       7,481,000 $ 525,000                    
Revolving Credit Facility [Member]                              
Debt Instrument [Line Items]                              
Write off of deferred financing costs               100,000              
Capitalized deferred financing costs       1,666,000   1,666,000   1,666,000              
Debt interest rate             1.86%     1.86%          
Line of credit facility, maximum borrowing capacity                         $ 300,000,000    
Increase in maximum borrowing capacity of credit facility                         $ 80,000,000    
Credit facility, borrowing capacity                             $ 100,000,000
Borrowings outstanding       100,000,000   100,000,000   100,000,000   $ 100,000,000          
Maximum leverage ratio             300.00%     300.00%          
Minimum interest coverage ratio             350.00%     350.00%          
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%                
Line of Credit [Member]                              
Debt Instrument [Line Items]                              
Line of credit facility, maximum borrowing capacity       2,562,000   2,562,000 SEK 20,000 2,562,000   $ 2,369,000          
Term Loan One [Member]                              
Debt Instrument [Line Items]                              
Debt, face amount | ¥                           ¥ 9,000,000  
Term Loan Two [Member]                              
Debt Instrument [Line Items]                              
Debt, face amount | ¥                       ¥ 9,000,000      
Debt outstanding       $ 1,450,000   $ 1,450,000   $ 1,450,000              
Term Loan Two [Member] | People's Bank of China One-Year Lending Rate [Member]                              
Debt Instrument [Line Items]                              
Interest rate multiplier               120.00%              
PST Eletronicaltda [Member]                              
Debt Instrument [Line Items]                              
Long-term debt, weighted average interest rate             7.30%     7.30%          
Short-term debt, weighted average interest rate             16.10%     16.10%          
PST Eletronicaltda [Member] | Term Loan [Member]                              
Debt Instrument [Line Items]                              
2016                   $ 13,526,000          
2017                   1,873,000          
2018                   986,000          
2019                   965,000          
2020                   331,000          
Thereafter                   $ 303,000