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Marketable Securities Textual (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investments, Debt and Equity Securities Textual [Abstract]        
Marketable Securities, Realized Gain (Loss) $ 26 $ 27 $ 66 $ 88