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Fair Value - Derivative Financial Instruments (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) derivative | Dec. 31, 2020 USD ($) derivative | Dec. 31, 2019 USD ($)
Derivative instruments and Hedging Activities |  |  |  |  |
Derivative, notional amounts settled during the period | $ 200,000,000 | $ 150,000,000 |  |  |
Receipts (payments) for termination of forward interest rate swaps | $ (2,211,000) | $ (6,962,000) | $ 4,751,000 | $ (25,135,000) | $ (12,309,000)
Unrealized gain (loss) on derivatives |  |  | 2,654,000 | 2,894,000 | 0
Gain (loss) on cash flow hedges |  |  | $ 993,000 | $ (17,731,000) | $ (11,930,000)
Fair Value Hedging |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |
Number of derivative instruments held | derivative |  |  | 0 | 0 |
Interest Rate Swap | Cash Flow Hedges Interest Rate Caps |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |
Notional balance |  |  | $ 150,000,000 |  |
Weighted average capped interest rate (as a percent) |  |  | 1.40% |  |
Derivatives, notional amounts entered into during period |  |  | $ 150,000,000 |  |
Interest Rate Caps |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |
Number of derivative instruments held | derivative |  |  | 5 |  |
Interest Rate Caps | Interest Rate Caps |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |
Notional balance |  |  | $ 402,670,000 |  |
Weighted average interest rate (as a percent) |  |  | 1.70% |  |
Weighted average capped interest rate (as a percent) |  |  | 6.10% |  |
Unsecured notes | Unsecured Notes 2.05 Percent |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |
Stated interest rate (as a percent) | 2.05% |  |  |  |
Unsecured Notes 2.05 Percent |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |
Face amount, debt instrument | $ 700,000,000 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |
Gain (loss) reclassification from accumulated OCI to income, estimated net amount to be transferred |  |  | $ 4,051,000 |  |

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