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Investment Operations Impaired Mortgage Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Impaired mortgage loans, Unpaid Principal Balance $ 21,459 $ 21,766  
Financing Receivable, Allowance for Credit Losses 713 851 $ 857
Debt Instrument, Unamortized Discount 0 87  
Impaired mortgage loans, Related Allowance $ 20,746 $ 20,828