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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]                          
Income tax expense (benefit) on operations $ (345) $ 32 $ (381) $ 147 $ (1,066) $ (1,174) $ 90 $ 294 $ (547) $ (1,856) $ 2,797    
Effective income tax rate                 (2.70%) (3.50%) 12.00%    
Unremitted earnings of foreign subsidiaries 37,648               $ 37,648        
Operating loss carry forwards, expiration dates                 Dec. 31, 2026        
General business and foreign tax credit carry forwards, expiration date                 Dec. 31, 2021        
Liability for uncertain tax positions reduction to noncurrent asset 3,993               $ 3,993        
Liability for uncertain tax positions, noncurrent 290               290        
Unrecognized tax benefits that would impact effective tax rate 4,280       3,851       4,280 $ 3,851      
Gross interest and penalties expense (benefit)                 (90) (411) $ (82)    
Accrued payment of interest and penalties 123       $ 213       123 213      
Goodwill impairment charge (benefit)                   $ 51,458      
State and Local Jurisdiction [Member]                          
Operating Loss Carryforwards [Line Items]                          
Net operating loss carry forwards 28,031               28,031        
General business and foreign tax credit carry forwards 1,602               1,602        
Foreign Tax Authority [Member]                          
Operating Loss Carryforwards [Line Items]                          
Net operating loss carry forwards 29,721               29,721        
General business and foreign tax credit carry forwards 1,404               1,404        
U.S. Federal [Member]                          
Operating Loss Carryforwards [Line Items]                          
Net operating loss carry forwards 89,800               89,800        
General business and foreign tax credit carry forwards $ 14,003               $ 14,003        
PST Eletronicaltda [Member]                          
Operating Loss Carryforwards [Line Items]                          
Equity method investment, ownership percentage                         50.00%
Increase in equity method investment, ownership percentage                       24.00%