XML 80 R66.htm IDEA: XBRL DOCUMENT v3.7.0.1
Investments in Marketable Securities Available-for-sale (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Proceeds from sales $ 38,532 $ 46,720 $ 22,021
Gross realized gains 137 261 15
Gross realized losses $ (127) $ (38) $ (46)