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Long-term debt Schedule of Derivative Instruments (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
2019 Interest Rate Cap Agreements Effective June 30, 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, effective date |  |  | Jun. 30, 2020 |  |
Derivative, expiration date |  |  | Jun. 30, 2024 |  |
2015 Interest Rate Cap Agreements Effective June 29, 2018 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, effective date |  |  | Jun. 29, 2018 |  |
Derivative, expiration date |  |  | Jun. 30, 2020 |  |
Other Long-term Assets | 2019 Interest Rate Cap Agreements Effective June 30, 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset, fair value, gross asset | $ 2,506,000 |  | $ 2,506,000 |  | $ 24,452,000
Other Long-term Assets | 2015 Interest Rate Cap Agreements Effective June 29, 2018 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset, fair value, gross asset | 0 |  | 0 |  | $ 0
Cash Flow Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of debt expense reclassified from accumulated OCI into income | 1,034,000 | $ 1,569,000 | 4,280,000 | $ 4,782,000 |
Amount of unrealized losses in OCI on interest rate cap agreements | (1,628,000) | $ (1,060,000) | (16,470,000) | $ (1,672,000) |
Debt Expense | Cash Flow Hedging | 2019 Interest Rate Cap Agreements Effective June 30, 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of debt expense reclassified from accumulated OCI into income |  |  | 1,378,000 |  |
Amount of unrealized losses in OCI on interest rate cap agreements |  |  | 21,946,000 |  |
Debt Expense | Cash Flow Hedging | 2015 Interest Rate Cap Agreements Effective June 29, 2018 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of debt expense reclassified from accumulated OCI into income |  |  | 4,326,000 |  |
Amount of unrealized losses in OCI on interest rate cap agreements |  |  | 0 |  |
Term Loan Facility | Maximum | 2019 Interest Rate Cap Agreements Effective June 30, 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amounts of interest rate agreements | 3,500,000,000 |  | $ 3,500,000,000 |  |
LIBOR plus interest rate margin |  |  | 2.00% |  |
Term Loan Facility | Maximum | 2015 Interest Rate Cap Agreements Effective June 29, 2018 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amounts of interest rate agreements | $ 3,500,000,000 |  | $ 3,500,000,000 |  |
LIBOR plus interest rate margin |  |  | 3.50% |  |

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