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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 4,794,226   $ 4,413,171      
Percentage of total 100.00%   100.00%      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ (4,786)   $ (3,254)      
Allowance for Loan and Lease Losses, Real Estate (10,366) $ (9,706) (9,384) $ (9,137) $ (8,156) $ (7,685)
Mortgage loans on real estate (net of allowances of $10,366 and $9,384) 4,779,074   4,400,533      
Apartment            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 543,917   $ 510,052      
Percentage of total 11.30%   11.60%      
Retail            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,365,157   $ 1,270,676      
Percentage of total 28.50%   28.80%      
Office building            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,633,887   $ 1,487,392      
Percentage of total 34.10%   33.60%      
Industrial            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 983,553   $ 938,612      
Percentage of total 20.50%   21.30%      
Other commercial            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 267,712   $ 206,439      
Percentage of total 5.60%   4.70%