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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 100.00% 100.00%    
Recorded investment $ 4,450,291 $ 4,413,171    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (3,433) (3,254)    
Allowance for Loan and Lease Losses, Real Estate (8,864) (9,384) $ (7,786) $ (7,685)
Mortgage loans on real estate (net of allowances of $8,864 and $9,384) $ 4,437,994 $ 4,400,533    
Apartment        
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 11.20% 11.60%    
Recorded investment $ 497,699 $ 510,052    
Retail        
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 27.80% 28.80%    
Recorded investment $ 1,236,933 $ 1,270,676    
Office building        
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 34.10% 33.60%    
Recorded investment $ 1,518,170 $ 1,487,392    
Industrial        
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 21.70% 21.30%    
Recorded investment $ 964,685 $ 938,612    
Other commercial        
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 5.20% 4.70%    
Recorded investment $ 232,804 $ 206,439