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Fair Value - Derivative Financial Instruments (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) derivative shares | Dec. 31, 2021 USD ($) derivative shares | Dec. 31, 2020 USD ($) shares
Derivative instruments and Hedging Activities |  |  |
Derivative, notional amounts settled during the period | $ 150,000,000 |  |
Payment for termination of forward interest rate swaps | (26,869,000) | $ (4,751,000) | $ 25,135,000
Gain (loss) on cash flow hedges | $ 23,647,000 | $ 993,000 | $ (17,731,000)
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500
Fair Value Hedging |  |  |
Derivative instruments and Hedging Activities |  |  |
Number of derivative instruments held | derivative | 0 | 0 |
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) | 5.30% |  |
Weighted average capped interest rate (as a percent) | 6.10% |  |
Unsecured Notes, 5.00% |  |  |
Derivative instruments and Hedging Activities |  |  |
Face amount, debt instrument | $ 350,000,000 |  |
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 | $ 1,415,000 |  |

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