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Marketable Equity Securities - Marketable Equity Securities and Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]    
Marketable equity securities at fair value $ 371 $ 202
Cost 91 91
Accumulated other comprehensive (loss) income for unrealized holding gains 280 $ 111
Deferred taxes on accumulated other comprehensive income for uinrealized holding gains (62)
Accumulated other comprehensive income $ 218 $ 111