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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 4,333,997   $ 3,783,207      
Percentage of total 100.00%   100.00%      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ (2,531)   $ 0      
Allowance for Loan and Lease Losses, Real Estate (9,137) $ (8,156) (7,685) $ (6,746) $ (6,499) $ (6,813)
Mortgage loans on real estate (net of allowances of $9,137 and $7,685) 4,322,329   3,775,522      
Apartment            
Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 508,367   $ 447,088      
Percentage of total 11.70%   11.80%      
Retail            
Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,316,463   $ 1,179,936      
Percentage of total 30.40%   31.20%      
Office building            
Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,426,673   $ 1,270,113      
Percentage of total 32.90%   33.60%      
Industrial            
Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 891,051   $ 713,461      
Percentage of total 20.60%   18.80%      
Other commercial            
Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 191,443   $ 172,609      
Percentage of total 4.40%   4.60%