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Investments: Gain/Loss on Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments [Abstract]      
Proceeds $ 44,164 $ 26,437 $ 27,327
Gross gains 119 245 449
Gross losses $ (686) $ (195) $ (357)