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Marketable Equity Securities - Changes in Marketable Securities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Investments [Abstract]    
Gross cash proceeds $ 809 $ 556
Cost 1,778 84
Gross (loss) gain on sale included in earnings during the period $ (969) $ 472
Deferred taxes on gross gain on sale included in earnings
Reclassification adjustment to unrealized gain (loss) in other comprehensive income for net loss (gain) included in earnings $ 969 $ (472)
Gross unrealized holding loss arising during the period included in other comprehensive loss. (1,296) $ (1,108)
Clearing of disproportionate tax effect for deferred taxes on unrealized holding losses included in other comprehensive loss 1,558
Net unrealized holding gain (loss) 262 $ (1,108)
Other comprehensive income (loss) from marketable equity securities $ 1,231 $ (1,580)