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Long-term debt Schedule of Derivative Instruments (Details) - 2019 Interest Rate Cap Agreements Effective June 30, 2020 - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |
Derivative, effective date | Jun. 30, 2020 |
Derivative, expiration date | Jun. 30, 2024 |
Other Long-term Assets |  |
Derivative [Line Items] |  |
Derivative asset, fair value, gross asset | $ 5,955 | $ 2,671
Debt Expense | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Amount of debt expense reclassified from accumulated OCI into income | 4,132 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 3,284 |
Term Loan Facility | Maximum |  |
Derivative [Line Items] |  |
Notional amounts of interest rate agreements | $ 3,500,000 |
LIBOR plus interest rate margin | 2.00% |

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