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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
 [1]
Jun. 30, 2016
 [1]
Mar. 31, 2016
 [1]
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2011
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]                          
Income tax expense (benefit) on operations $ (39,503) [1] $ 919 $ 1,350 $ 845 $ (345) $ 32 $ (381) $ 147 $ (36,389) $ (547) $ (1,856)    
Effective income tax rate                 (92.80%) (2.70%) (3.50%)    
Unremitted earnings of foreign subsidiaries 44,898               $ 44,898        
General business tax credit carry forwards, expiration date                 Dec. 31, 2021        
Liability for uncertain tax positions reduction to noncurrent asset 3,731               $ 3,731        
Liability for uncertain tax positions, noncurrent 146               146        
Unrecognized tax benefits that would impact effective tax rate 3,821       4,280       3,821 $ 4,280      
Gross interest and penalties expense (benefit)                 (59) (90) $ (411)    
Accrued payment of interest and penalties 64       $ 123       64 $ 123      
Goodwill impairment charge (benefit)                     $ 51,458    
State and Local Jurisdiction [Member]                          
Operating Loss Carryforwards [Line Items]                          
Net operating loss carry forwards 41,222               41,222        
General business and foreign tax credit carry forwards 1,530               1,530        
Foreign Tax Authority [Member]                          
Operating Loss Carryforwards [Line Items]                          
Net operating loss carry forwards 35,849               35,849        
General business and foreign tax credit carry forwards 1,510               1,510        
U.S. Federal [Member]                          
Operating Loss Carryforwards [Line Items]                          
Net operating loss carry forwards 53,064               $ 53,064        
Operating loss carry forwards, expiration dates                 Dec. 31, 2026        
General business and foreign tax credit carry forwards $ 15,254               $ 15,254        
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 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.