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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Valuation allowance $ (19,776) $ (9,179)
Commercial Real Estate Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding 3,689,302 3,458,914
Deferred prepayment fees (901) (942)
Amortized cost 3,688,401 3,457,972
Valuation allowance (19,776) (9,179)
Carrying value $ 3,668,625 $ 3,448,793