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Marketable Securities (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Marketable Securities [Abstract]      
Other comprehensive income from available-for-sale securities, Beginning $ 40 $ 35  
Losses/Gains reclassified into earnings from marketable securities (94) 16
Unrealized losses from available-for-sale securities (4) (11)  
Other comprehensive income/loss from available-for-sale securities, Ending $ (58) $ 40 $ 35