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Investments (Loan Valuation Allowance for Mortgage Loans) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Allowance For Loan And Lease Losses Roll Forward    
Balance, Beginning of Period $ 9,384 $ 7,685
Provision (release) (516) 101
Valuation Allowances and Reserves, Additions for Adjustments (4) 0
Balance, End of Period $ 8,864 $ 7,786