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Long-Term Debt - Interest Rate Cap and Swap Agreement (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |  |  |  |
Debt expense recognized |  |  | $ 461,897,000 | $ 406,341,000 | $ 394,013,000
Weighted average effective interest rate at period end | 5.19% |  | 5.19% |  |
Weighted average effective interest rate during the period |  |  | 4.96% |  |
Interest Rate Cap Agreements Effective September 30, 2016 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, expiration date |  | Jun. 30, 2018 |  |  |
Debt expense recognized |  |  | $ 4,140,000 |  |
Interest Rate Cap Agreements Effective June 29, 2018 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, effective date |  |  | Jun. 29, 2018 |  |
Derivative, expiration date |  |  | Jun. 30, 2020 |  |
Fair value of assets | $ 851,000 |  | $ 851,000 |  |
Debt expense recognized |  |  | 4,327,000 |  |
Amount of unrealized losses in OCI on interest rate cap and swap agreements |  |  | (181,000) |  |
Term Loan B | Maximum | Interest rate cap agreements 1 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Asset, Notional Amount |  | $ 3,500,000,000 |  |  |
Term Loan Facility | Maximum | Interest rate cap agreements 1 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Asset, Notional Amount | $ 3,500,000,000 |  | $ 3,500,000,000 |  |
Debt instrument, variable interest rate margin | 3.50% | 3.50% |  |  |
Senior Secured Credit Facilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average effective interest rate at period end | 5.11% |  | 5.11% |  |

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