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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 16, 2017
Dec. 31, 2017
Sep. 30, 2017
 [1]
Jun. 30, 2017
 [1]
Mar. 31, 2017
 [1]
Dec. 31, 2016
Sep. 30, 2016
 [2]
Jun. 30, 2016
 [2]
Mar. 31, 2016
 [2]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2011
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]                            
Income tax expense (benefit) on operations   $ (6,036) [1] $ 3,809 $ 5,189 $ 4,571 $ (39,503) [2] $ 919 $ 1,350 $ 845 $ 7,533 $ (36,389) $ (547)    
Effective income tax rate                   14.30% (92.80%) (2.70%)    
Unremitted earnings of foreign subsidiaries   47,860               $ 47,860        
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability                   (15,269)        
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount                   6,207        
Income Tax, Expense (Benefit) from Tax Legislation                   (9,062)        
General business tax credit carry forwards, expiration date                     Dec. 31, 2023      
Reduction of noncurrent deferred tax asset                   (15,269)        
Liability for uncertain tax positions reduction to noncurrent asset   3,218               3,218        
Liability for uncertain tax positions, noncurrent   444               444        
Unrecognized tax benefits that would impact effective tax rate           3,645         $ 3,645 $ 3,821    
Gross interest and penalties expense (benefit)                   (33) (59) $ (90)    
Accrued payment of interest and penalties   32       $ 64       32 $ 64      
Defered Tax Liability, Investments, Change in Basis during the Period                   8,100        
Increase in equity method investment, ownership percentage 26.00%                          
State and Local Jurisdiction [Member]                            
Operating Loss Carryforwards [Line Items]                            
Net operating loss carry forwards   42,571               42,571        
General business and foreign tax credit carry forwards   1,753               1,753        
Foreign Tax Authority [Member]                            
Operating Loss Carryforwards [Line Items]                            
Net operating loss carry forwards   35,075               35,075        
General business and foreign tax credit carry forwards   1,023               1,023        
U.S. Federal [Member]                            
Operating Loss Carryforwards [Line Items]                            
General business and foreign tax credit carry forwards   $ 27,336               $ 27,336        
PST Eletronica Ltda [Member]                            
Operating Loss Carryforwards [Line Items]                            
Equity method investment, ownership percentage                           50.00%
Increase in equity method investment, ownership percentage                         24.00%  
[1] The impact of the Tax Legislation was an increase in tax expense of $6.2 million due to the one-time deemed repatriation tax, offset by the favorable impacts of the reduced tax rate on the Company's net deferred tax liabilities and other deferred tax adjustments of $(15.3) million related to certain earnings included in the one-time transition tax.
[2] The Company recorded the release of a valuation allowance associated with its U.S. federal, certain state and foreign deferred tax assets for the year ended December 31, 2016.