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Marketable Equity Securities - Marketable Equity Securities and Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Marketable Securities, Equity Securities [Abstract]    
Marketable equity securities at fair value $ 1,098 $ 202
Cost 274 91
Accumulated other comprehensive (loss) income for unrealized holding gains 824 111
Deferred taxes on accumulated other comprehensive income for unrealized holding gains (264)
Accumulated other comprehensive income $ 560 $ 111