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Long-Term Debt - Derivative Instruments (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest Rate Cap Agreements Effective June 29, 2018      
Derivative [Line Items]      
Derivative, effective date Jun. 29, 2018    
Derivative, expiration date Jun. 30, 2020    
Interest Rate Cap Agreements Member Effective June 30, 2019      
Derivative [Line Items]      
Derivative, effective date Jun. 30, 2020    
Derivative, expiration date Jun. 30, 2024    
Term Loan Facility | Interest Rate Cap Agreements Effective June 29, 2018 | Maximum      
Derivative [Line Items]      
Notional amounts of interest rate agreements $ 3,500,000,000    
LIBOR plus interest margin 3.50%    
Term Loan Facility | Interest Rate Cap Agreements Member Effective June 30, 2019 | Maximum      
Derivative [Line Items]      
Notional amounts of interest rate agreements $ 3,500,000,000    
LIBOR plus interest margin 2.00%    
Cash Flow Hedging      
Derivative [Line Items]      
Amount of debt expense reclassified from accumulated OCI into income $ 6,377,000 $ 6,286,000 $ 5,058,000
Amount of unrealized gains (losses) in OCI on interest rate cap and swap agreements 1,151,000 (133,000) $ (5,437,000)
Debt Expense | Cash Flow Hedging | Interest Rate Cap Agreements Effective June 29, 2018      
Derivative [Line Items]      
Amount of debt expense reclassified from accumulated OCI into income 8,654,000    
Amount of unrealized gains (losses) in OCI on interest rate cap and swap agreements (851,000)    
Debt Expense | Cash Flow Hedging | Interest Rate Cap Agreements Member Effective June 30, 2019      
Derivative [Line Items]      
Amount of unrealized gains (losses) in OCI on interest rate cap and swap agreements 2,417,000    
Other long-term assets | Interest Rate Cap Agreements Effective June 29, 2018      
Derivative [Line Items]      
Derivative asset, fair value, gross asset 0 $ 851,000  
Other long-term assets | Interest Rate Cap Agreements Member Effective June 30, 2019      
Derivative [Line Items]      
Derivative asset, fair value, gross asset $ 24,452,000