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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 5,667,354   $ 4,983,354      
Percentage of total 100.00%   100.00%      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ (8,314)   $ (5,770)      
Allowance for Loan and Lease Losses, Real Estate (11,775) $ (11,692) (11,286) $ (10,366) $ (9,706) $ (9,384)
Mortgage loans on real estate (net of allowances of $11,775 and $11,286) 5,647,265   4,966,298      
Apartment            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 748,392   $ 571,291      
Percentage of total 13.20%   11.50%      
Retail            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,645,521   $ 1,432,394      
Percentage of total 29.00%   28.70%      
Office building            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,787,871   $ 1,725,748      
Percentage of total 31.60%   34.60%      
Industrial            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,137,598   $ 961,924      
Percentage of total 20.10%   19.30%      
Other commercial            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 347,972   $ 291,997      
Percentage of total 6.10%   5.90%