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Derivative Instruments, Hedging Activities and Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Average cap interest rate (as percent) | 4.20% |  |
Interest rate fair value hedge liability at fair value | $ 32,100 | $ 16,800 |
Gain (loss) reclassified to earnings | (4,000) | 600 |
Gain (loss) reclassified to earnings |  |  | $ 800
Interest expense | 50,399 | 59,268 | $ 66,785
Increase as Hedged Forecasted Interest Payments Occur |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Interest expense | 6,400 |  |
Accrued Interest |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Interest rate fair value hedge liability at fair value | 400 | $ 100 |
Cash Flow Hedging |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount | $ 250,000 |  |

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