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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 3,458,914 | $ 2,952,464 | $ 2,674,315
Percent | 100.00% | 100.00% |
East |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 645,991 | $ 586,773 |
Percent | 18.70% | 19.90% |
Middle Atlantic |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 284,597 | $ 168,969 |
Percent | 8.20% | 5.70% |
Mountain |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 389,892 | $ 357,642 |
Percent | 11.30% | 12.10% |
New England |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 9,152 | $ 9,418 |
Percent | 0.30% | 0.30% |
Pacific |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 655,518 | $ 521,363 |
Percent | 19.00% | 17.70% |
South Atlantic |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 751,199 | $ 694,599 |
Percent | 21.70% | 23.50% |
West North Central |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 302,534 | $ 291,890 |
Percent | 8.70% | 9.90% |
West South Central |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 420,031 | $ 321,810 |
Percent | 12.10% | 10.90% |
Office |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 250,287 | $ 268,932 |
Percent | 7.30% | 9.10% |
Medical Office |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 29,990 | $ 33,467 |
Percent | 0.90% | 1.10% |
Retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 1,225,670 | $ 1,091,627 |
Percent | 35.40% | 37.00% |
Industrial/Warehouse |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 896,558 | $ 762,887 |
Percent | 25.90% | 25.80% |
Apartment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 858,679 | $ 600,638 |
Percent | 24.80% | 20.30% |
Agricultural |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 51,303 | $ 25,000 |
Percent | 1.50% | 0.90% |
Mixed Use/Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 146,427 | $ 169,913 |
Percent | 4.20% | 5.80% |

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