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Investment in Securities, Investment in Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Trading securities [Abstract]      
Cost $ 16 $ 385 $ 0
Fair value 16 368 0
Available for sale securities [Abstract]      
Cost 17,649 17,898 13,561
Fair value 32,873 32,607 34,095
Total investments in securities [Abstract]      
Cost 17,665 18,283 13,561
Fair value 32,889 32,975 34,095
Common Stock [Member]      
Trading securities [Abstract]      
Cost 16 385 0
Fair value 16 368 0
Available for sale securities [Abstract]      
Cost 17,649 17,898 13,561
Fair value $ 32,873 $ 32,607 $ 34,095