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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 2,562,449 $ 2,490,619
Percent 100.00% 100.00%
East [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 596,587 $ 635,434
Percent 23.30% 25.50%
Middle Atlantic [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 155,234 $ 151,640
Percent 6.10% 6.10%
Mountain [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 302,764 $ 235,932
Percent 11.80% 9.50%
New England [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 12,496 $ 12,724
Percent 0.50% 0.50%
Pacific [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 423,086 $ 385,683
Percent 16.50% 15.50%
South Atlantic [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 542,146 $ 519,065
Percent 21.20% 20.80%
West North Central [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 311,126 $ 325,447
Percent 12.10% 13.10%
West South Central [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 219,010 $ 224,694
Percent 8.50% 9.00%
Office [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 291,118 $ 308,578
Percent 11.40% 12.40%
Medical Office [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 35,248 $ 50,780
Percent 1.40% 2.10%
Retail [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 989,810 $ 886,942
Percent 38.60% 35.60%
Industrial/Warehouse [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 691,630 $ 700,644
Percent 27.00% 28.10%
Apartment [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 377,170 $ 375,837
Percent 14.70% 15.10%
Mixed Use/Other [Member]    
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding $ 177,473 $ 167,838
Percent 6.90% 6.70%