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Investments (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
investment
Dec. 31, 2015
USD ($)
Investments (Textual) [Abstract]    
Investment impairment charges $ 139 $ 151
Other than temporary impairments $ 0 $ 274
Number of securities in a gross unrealized loss position | investment 47  
Number of securities in a gross unrealized loss position for more than twelve months | investment 10  
Unrealized loss $ 79