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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - Commercial Mortgage Loans - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 518,719 |
2020 - Average LTV | 64.00% |
2019 - Amortized cost | $ 799,514 |
2019 - Average LTV | 66.00% |
2018 - Amortized cost | $ 574,537 |
2018 - Average LTV | 63.00% |
2017 - Amortized cost | $ 480,158 |
2017 - Average LTV | 60.00% |
2016 - Amortized cost | $ 432,635 |
2016 - Average LTV | 56.00% |
Prior - Amortized cost | $ 1,021,551 |
Prior - Average LTV | 48.00% |
Amortized cost | $ 3,827,114 | $ 3,457,972
Total - Average LTV | 58.00% |
Debt Service Coverage Ratio: Greater Than or Equal to 1.5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 316,727 |
2020 - Average LTV | 64.00% |
2019 - Amortized cost | $ 455,910 |
2019 - Average LTV | 67.00% |
2018 - Amortized cost | $ 405,363 |
2018 - Average LTV | 61.00% |
2017 - Amortized cost | $ 310,373 |
2017 - Average LTV | 58.00% |
2016 - Amortized cost | $ 378,311 |
2016 - Average LTV | 55.00% |
Prior - Amortized cost | $ 816,947 |
Prior - Average LTV | 46.00% |
Amortized cost | $ 2,683,631 |
Total - Average LTV | 56.00% |
Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 187,242 |
2020 - Average LTV | 63.00% |
2019 - Amortized cost | $ 256,913 |
2019 - Average LTV | 69.00% |
2018 - Amortized cost | $ 141,693 |
2018 - Average LTV | 68.00% |
2017 - Amortized cost | $ 151,241 |
2017 - Average LTV | 65.00% |
2016 - Amortized cost | $ 54,324 |
2016 - Average LTV | 62.00% |
Prior - Amortized cost | $ 159,528 |
Prior - Average LTV | 54.00% |
Amortized cost | $ 950,941 |
Total - Average LTV | 64.00% |
Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 5,966 |
2020 - Average LTV | 68.00% |
2019 - Amortized cost | $ 61,471 |
2019 - Average LTV | 58.00% |
2018 - Amortized cost | $ 8,931 |
2018 - Average LTV | 75.00% |
2017 - Amortized cost | $ 15,548 |
2017 - Average LTV | 64.00% |
2016 - Amortized cost | $ 0 |
2016 - Average LTV | 0.00% |
Prior - Amortized cost | $ 22,868 |
Prior - Average LTV | 63.00% |
Amortized cost | $ 114,784 |
Total - Average LTV | 62.00% |
Debt Service Coverage Ratio: Less Than 1.0 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 8,784 |
2020 - Average LTV | 60.00% |
2019 - Amortized cost | $ 25,220 |
2019 - Average LTV | 44.00% |
2018 - Amortized cost | $ 18,550 |
2018 - Average LTV | 65.00% |
2017 - Amortized cost | $ 2,996 |
2017 - Average LTV | 62.00% |
2016 - Amortized cost | $ 0 |
2016 - Average LTV | 0.00% |
Prior - Amortized cost | $ 22,208 |
Prior - Average LTV | 51.00% |
Amortized cost | $ 77,758 |
Total - Average LTV | 54.00% |

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