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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
State and Local Jurisdiction [Member]
Dec. 31, 2013
Foreign Tax Authority [Member]
Dec. 31, 2013
U.S. Federal [Member]
Dec. 31, 2011
PST Eletronicaltda [Member]
Dec. 31, 2011
PST Eletronicaltda [Member]
Dec. 30, 2011
PST Eletronicaltda [Member]
Dec. 31, 2010
PST Eletronicaltda [Member]
Operating Loss Carryforwards [Line Items]                                    
Provision for income taxes $ 1,066 $ 1,016 $ 1,125 $ 1,019 $ 95 $ 383 $ (884) $ 1,218 $ 4,226 $ 812 $ 26,105              
Effective income tax rate                 20.40% 17.80% 36.40%              
Unremitted earnings of foreign subsidiaries                           27,509        
Net operating loss carry forwards                       96,260 22,381 106,637        
Operating loss carry forwards, expiration dates                 Dec. 31, 2025                  
General business and foreign tax credit carry forwards                       2,005 1,908 12,271        
General business and foreign tax credit carry forwards, expiration date                 Dec. 31, 2021                  
Equity method investment, ownership percentage                                 50.00% 50.00%
Reduction of noncurrent deferred tax asset                 3,329                  
Liability for uncertain tax positions, noncurrent 639               639                  
Amount affecting the Company's tax rate                 3,547                  
Gross interest and penalties                 (82) 64 67              
Accrued payment of interest and penalties 624       706       624 706                
Deferred tax liability related to earnings that are not considered indefinitely reinvested                           $ 456        
Increase in equity method investment, ownership percentage                             24.00% 24.00%