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Investment in NEC TOKIN - Summarized Financial Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Apr. 19, 2017
Jun. 30, 2017
Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]      
Document Period End Date   Jun. 30, 2017  
NEC TOKIN Corporation [Member]      
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
Sales $ 23,649   $ 120,510
Gross profit 6,647   $ 26,546
Net income (loss) (1) $ 247,786