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Fair Value (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) derivative | Sep. 30, 2021 USD ($) derivative | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) derivative | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Derivative instruments and Hedging Activities |  |  |  |  |  |
Derivative, Notional Amounts Settled During Period | $ 200,000,000 |  | $ 150,000,000 |  |  |
Receipt (payment) for termination of forward interest rate swaps | $ (2,211,000) |  | 6,962,000 | $ 4,751,000 | $ (25,135,000) |
Unrealized gain on terminated cash flow hedges |  |  | $ (2,654,000) | (2,654,000) | $ 0 | $ 2,894,000
Interest Rate Swap | Cash Flow Hedges |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |
Derivative, Notional Amounts Entered Into During Period |  | $ 150,000,000 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |
Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months |  |  |  | $ 4,051,000 |  |
Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |
Number of derivative instruments held | derivative | 5 | 5 |  | 5 |  |

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