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Investments in Marketable Securities Available-for sale (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]      
Proceeds from sales $ 46,720 $ 22,021 $ 21,792
Gross realized gains 261 15 17
Gross realized losses $ (38) $ (46) $ (25)