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Investment in NEC TOKIN Equity Method Investments Summarized Financial Information (Details) (Nectokin Corporation [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Nectokin Corporation [Member]
   
245709 $ 122,408 $ 123,192
302161 26,678 18,300
120929 $ (3,154) $ (8,729)