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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 100.00% 100.00%    
Recorded investment $ 3,879,769 $ 3,783,207    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (674) 0    
Allowance for Loan and Lease Losses, Real Estate (7,786) (7,685) $ (6,824) $ (6,813)
Mortgage loans on real estate (net of allowances of $7,786 and $7,685) $ 3,871,309 $ 3,775,522    
Apartment        
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 11.00% 11.80%    
Recorded investment $ 425,614 $ 447,088    
Retail        
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 31.00% 31.20%    
Recorded investment $ 1,202,317 $ 1,179,936    
Office building        
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 34.20% 33.60%    
Recorded investment $ 1,329,399 $ 1,270,113    
Industrial        
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 19.40% 18.80%    
Recorded investment $ 750,978 $ 713,461    
Other commercial        
Mortgage Loans on Real Estate [Line Items]        
Percentage of total 4.40% 4.60%    
Recorded investment $ 171,461 $ 172,609