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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 4,572,563   $ 4,413,171      
Percentage of total 100.00%   100.00%      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ (4,188)   $ (3,254)      
Allowance for Loan and Lease Losses, Real Estate (9,706) $ (8,864) (9,384) $ (8,156) $ (7,786) $ (7,685)
Mortgage loans on real estate (net of allowances of $9,706 and $9,384) 4,558,669   4,400,533      
Apartment            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 530,599   $ 510,052      
Percentage of total 11.60%   11.60%      
Retail            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,296,157   $ 1,270,676      
Percentage of total 28.30%   28.80%      
Office building            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,546,148   $ 1,487,392      
Percentage of total 33.90%   33.60%      
Industrial            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 962,049   $ 938,612      
Percentage of total 21.00%   21.30%      
Other commercial            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 237,610   $ 206,439      
Percentage of total 5.20%   4.70%