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Marketable Equity Securities - Changes in Marketable Securities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Marketable Securities, Equity Securities [Abstract]        
Gross cash proceeds $ 16 $ 290 $ 56 $ 809
Cost 6 1,623 16 1,778
Gross gain (loss) on sale included in earnings during the period 10 (1,333) 40 (969)
Deferred taxes on gross gain on sale included in earnings (4) (15)
Reclassification adjustment to unrealized gain in other comprehensive income for net gains included in earnings (6) 1,333 (25) 969
Gross unrealized holding (loss) gain arising during the period included in other comprehensive loss 83 (647) 753 (1,310)
Deferred taxes on unrealized holding gain included in other comprehensive loss (31) (279)
Clearing of disproportionate tax effect for deferred taxes on unrealized holding losses included in other comprehensive loss 1,558 1,558
Net unrealized holding gain 52 911 474 248
Other comprehensive income from marketable equity securities $ 46 $ 2,244 $ 449 $ 1,217