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Fair Value (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) derivative | Jun. 30, 2021 USD ($) derivative | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Derivative instruments and Hedging Activities |  |  |  |
Derivative, Notional Amounts Settled During Period |  | $ 150,000,000 |  |
Receipt (payment) for termination of forward interest rate swaps |  | 6,962,000 | $ (25,135,000) |
Unrealized gain on terminated cash flow hedges |  | (2,654,000) | $ 0 | $ 2,894,000
Interest Rate Swap | Cash Flow Hedges |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Derivative, Notional Amount | $ 150,000,000 | $ 150,000,000 |  |
Derivative, Notional Amounts Entered Into During Period | $ 150,000,000 |  |  |
Derivative, average cap interest rate | 1.50% | 1.50% |  |
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 |  | $ 9,467,000 |  |
Not Designated as Hedging Instrument |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Number of derivative instruments held | derivative | 5 | 5 |  |
Not Designated as Hedging Instrument | Interest Rate Cap |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Derivative, Notional Amount | $ 410,950,000 | $ 410,950,000 |  |
Derivative, average cap interest rate | 6.10% | 6.10% |  |

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