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Quarterly Financial Information (Unaudited) - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 12, 2018
Effect of Fourth Quarter Events [Line Items]                        
Revenues $ 543,700,000 $ 516,200,000 $ 485,500,000 $ 431,300,000 $ 491,700,000 $ 457,600,000 $ 415,800,000 $ 389,400,000 $ 1,976,700,000 $ 1,754,500,000 $ 1,554,800,000  
Net income (loss) $ 33,300,000 $ 46,200,000 $ 300,000 $ 10,100,000 214,300,000 $ 12,800,000 $ (27,600,000) $ 39,200,000 69,100,000 160,300,000 $ (19,700,000)  
Impairment of intangible assets, finite-lived                 0      
Loss on early extinguishment on debt                 $ 5,400,000 11,400,000    
Senior Secured Second Priority Notes | 2022 Notes                        
Effect of Fourth Quarter Events [Line Items]                        
Principal amount redeemed         122,000,000         122,000,000   $ 61,000,000
Senior Secured Second Priority Notes | 2024 Notes                        
Effect of Fourth Quarter Events [Line Items]                        
Principal amount redeemed         $ 125,000,000         $ 125,000,000   $ 62,500,000