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Marketable Equity Securities - Marketable Equity Securities and Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Investments [Abstract]    
Marketable equity securities at fair value $ 202 $ 2,308
Cost 91 1,870
Accumulated other comprehensive income for unrealized holding gains $ 111 438
Deferred taxes on accumulated other comprehensive income for unrealized holding gains (1,558)
Accumulated other comprehensive income (loss) $ 111 $ (1,120)