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Marketable Equity Securities - Marketable Equity Securities Changes in Marketable Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accounting Policies [Abstract]    
Gross unrealized holding (loss) gain arising during the period included in other comprehensive loss $ 169 $ (598)
Deferred taxes on unrealized holding (loss) gain included in other comprehensive loss $ (62) 207
Valuation allowance on deferred taxes on unrealized holding losses included in other comprehensive loss (207)
Net unrealized holding (loss) gain in other comprehensive income (loss) $ 107 $ (598)