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Marketable Equity Securities - Changes in Marketable Securities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Investments [Abstract]        
Gross cash proceeds $ 290 $ 83 $ 809 $ 556
Cost 1,623 14 1,778 84
Gross (loss) gain on sale included in earnings during the period $ (1,333) $ 69 $ (969) $ 472
Deferred taxes on gross gain on sale included in earnings
Reclassification adjustment to unrealized loss (gain) in other comprehensive income for net gain (loss) included in earnings $ 1,333 $ (69) $ 969 $ (472)
Gross unrealized holding (loss) gain arising during the period included in other comprehensive loss (647) $ (625) (1,310) $ (404)
Clearing of disproportionate tax effect for deferred taxes on unrealized holding losses - included in other comprehensive loss 1,558 1,558
Net unrealized holding loss (gain) in other comprehensive income 911 $ (625) 248 $ (404)
Total other comprehensive gain (loss) from marketable equity securities $ 2,244 $ (694) $ 1,217 $ (876)