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Derivatives - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Apr. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Feb. 22, 2017
Derivative [Line Items]                  
Hedging ineffectiveness recorded in earnings $ 0 $ 0 $ 0 $ 0          
Estimated loss reclassified from other comprehensive income (loss) to earnings as contracts settle     5,000,000            
Interest expense 39,743,000 39,291,000 117,364,000 116,809,000          
Interest rate swaps                  
Derivative [Line Items]                  
Notional amount $ 750,000,000   $ 750,000,000       $ 750,000,000 $ 750,000,000  
Interest rate swaps, 2019 | Cash Flow Hedging                  
Derivative [Line Items]                  
Notional amount           $ 600,000,000      
Interest rate swaps, 2020 | Cash Flow Hedging                  
Derivative [Line Items]                  
Notional amount           300,000,000      
Interest rate swaps, 2021 | Cash Flow Hedging                  
Derivative [Line Items]                  
Notional amount           $ 450,000,000      
Interest Rate Swap, Floating Term Loan B, 2020 And 2021 | Cash Flow Hedging                  
Derivative [Line Items]                  
Notional amount         $ 150,000,000        
Designated as Hedging Instrument | Interest rate swaps                  
Derivative [Line Items]                  
Accumulated losses in other comprehensive income                 $ 14,000,000
Derivatives Not Designated as Hedging Instruments | Reclassification out of AOCI                  
Derivative [Line Items]                  
Interest expense   $ 2,000,000   $ 6,000,000