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Goodwill (Change in the Carrying Amount of PST Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Goodwill, beginning balance     $ 54,348  
Acquisition of business     641  
Goodwill impairment charge (29,300)    (29,300)   
Currency translation     2,962  
Goodwill, ending balance 28,651   28,651  
PST [Member]
        
Goodwill, beginning balance     53,744  
Goodwill impairment charge (29,300)   (29,300)  
Currency translation     2,985  
Goodwill, ending balance 27,429   27,429  
Electronics [Member]
        
Goodwill, beginning balance     604  
Acquisition of business     641  
Currency translation     (23)  
Goodwill, ending balance $ 1,222   $ 1,222