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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, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 3,092,558 $ 2,952,464
Percent 100.00% 100.00%
East    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 586,068 $ 586,773
Percent 19.00% 19.90%
Middle Atlantic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 210,993 $ 168,969
Percent 6.80% 5.70%
Mountain    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 374,429 $ 357,642
Percent 12.10% 12.10%
New England    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 9,286 $ 9,418
Percent 0.30% 0.30%
Pacific    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 560,882 $ 521,363
Percent 18.10% 17.70%
South Atlantic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 704,523 $ 694,599
Percent 22.80% 23.50%
West North Central    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 282,706 $ 291,890
Percent 9.10% 9.90%
West South Central    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 363,671 $ 321,810
Percent 11.80% 10.90%
Office    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 243,948 $ 268,932
Percent 7.90% 9.10%
Medical Office    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 31,402 $ 33,467
Percent 1.00% 1.10%
Retail    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 1,126,770 $ 1,091,627
Percent 36.40% 37.00%
Industrial/Warehouse    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 856,481 $ 762,887
Percent 27.70% 25.80%
Apartment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 633,492 $ 600,638
Percent 20.50% 20.30%
Agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 39,226 $ 25,000
Percent 1.30% 0.90%
Mixed Use/Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding $ 161,239 $ 169,913
Percent 5.20% 5.80%