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Long-term debt Schedule of Derivative Instruments (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Interest Rate Cap Agreements Effective June 29, 2018 |  |  |
Derivative [Line Items] |  |  |
Derivative, Effective Date | Jun. 29, 2018 |  |
Derivative, expiration date | Jun. 30, 2020 |  |
Derivative Asset, Fair Value, Gross Asset | $ 70,000 |  | $ 851,000
Term Loan Facility | Interest Rate Cap One | Maximum |  |  |
Derivative [Line Items] |  |  |
Notional amounts of interest rate agreements | $ 3,500,000,000 |  |
LIBOR plus interest rate margin | 3.50% |  |
Cash Flow Hedging |  |  |
Derivative [Line Items] |  |  |
Amount of losses reclassified from accumulated OCI into income | $ (1,606,000) | $ (1,537,000) |
Amount of unrecognized (losses) gains in OCI on interest rate cap agreements | 580,000 | (1,050,000) |
Debt Expense | Cash Flow Hedging | Interest rate cap agreements |  |  |
Derivative [Line Items] |  |  |
Amount of losses reclassified from accumulated OCI into income | (2,163,000) | (2,070,000) |
Amount of unrecognized (losses) gains in OCI on interest rate cap agreements | $ 781,000 | $ (1,414,000) |

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