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Goodwill (Change in the Carrying Amount of PST Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
PST [Member]
Jun. 30, 2014
PST [Member]
Sep. 30, 2014
PST [Member]
Sep. 30, 2014
Electronics [Member]
Goodwill, beginning balance     $ 54,348     $ 53,744 $ 53,744 $ 604
Acquisition of business     664         664
Goodwill impairment charge (benefit) 5,802    (23,498)    5,802 (29,300) (23,498)  
Currency translation     (193)       (69) (124)
Goodwill, ending balance $ 31,321   $ 31,321   $ 30,177   $ 30,177 $ 1,144