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Fair Value Measurement (Financial Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Value |  |
Financial assets: |  |
Other assets | $ 39,584 | $ 31,128
Financial liabilities: |  |
Other liabilities | 51,456 | 30,334
Carrying Value | Senior notes due 2023 |  |
Financial liabilities: |  |
Debt instruments | 250,000 | 250,000
Carrying Value | Mortgage loans |  |
Financial liabilities: |  |
Debt instruments | 0 | 36,113
Carrying Value | Contribution Certificates |  |
Financial liabilities: |  |
Debt instruments | 175,766 | 0
Carrying Value | BOLI |  |
Financial assets: |  |
Short-term and other investments | 80,821 | 67,847
Carrying Value | Other investments |  |
Financial assets: |  |
Short-term and other investments | 3,170 | 2,952
Fair Value |  |
Financial assets: |  |
Other assets | 39,593 | 31,141
Financial liabilities: |  |
Other liabilities | 51,456 | 30,334
Fair Value | Senior notes due 2023 |  |
Financial liabilities: |  |
Debt instruments | 267,988 | 269,160
Fair Value | Mortgage loans |  |
Financial liabilities: |  |
Debt instruments | 0 | 36,113
Fair Value | Contribution Certificates |  |
Financial liabilities: |  |
Debt instruments | 178,728 | 0
Fair Value | BOLI |  |
Financial assets: |  |
Short-term and other investments | 80,821 | 67,847
Fair Value | Other investments |  |
Financial assets: |  |
Short-term and other investments | $ 3,170 | $ 2,952

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