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Goodwill (Change in the Carrying Amount of PST Goodwill) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Goodwill, beginning balance   $ 1,078 $ 54,348
Acquisition of business     641
Goodwill impairment charge $ (29,300)   (29,300)
Currency translation     2,962
Goodwill, ending balance 28,651 1,003 28,651
PST [Member]      
Goodwill, beginning balance     53,744
Goodwill impairment charge     (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   $ (75) (23)
Goodwill, ending balance $ 1,222   $ 1,222