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Debt - Face Value of Outstanding Debt (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt outstanding $ 3,301,974,000 $ 3,363,420,000
Finance lease obligations 7,262,000  
Finance lease obligations   12,368,000
Face value of total debt outstanding 3,384,141,000 3,431,855,000
Less current portion of debt outstanding (82,167,000) (68,435,000)
Senior secured credit facilities | Term Loan A    
Debt Instrument [Line Items]    
Debt outstanding $ 498,750,000 527,250,000
Senior secured credit facilities | Term Loan A | LIBOR    
Debt Instrument [Line Items]    
Basis spread on LIBOR 2.25%  
Senior secured credit facilities | Term Loan B    
Debt Instrument [Line Items]    
Debt outstanding $ 1,848,129,000 1,862,237,000
Senior secured credit facilities | Term Loan B | LIBOR    
Debt Instrument [Line Items]    
Basis spread on LIBOR 2.00%  
Senior secured credit facilities | Revolver, $400 million    
Debt Instrument [Line Items]    
Debt outstanding $ 0 0
Credit facility amount $ 400,000,000  
Senior secured credit facilities | Revolver, $400 million | LIBOR    
Debt Instrument [Line Items]    
Basis spread on LIBOR 2.00%  
Senior secured notes | 5.375% senior secured notes due 2023    
Debt Instrument [Line Items]    
Debt outstanding $ 530,000,000 530,000,000
Outstanding debt rate 5.375%  
Senior secured notes | 5.25% senior secured notes due 2023    
Debt Instrument [Line Items]    
Debt outstanding $ 500,000,000 $ 500,000,000
Outstanding debt rate 5.25%