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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
May 01, 2019
Dec. 31, 2018
Apr. 28, 2017
Components of Long-term debt        
Total outstanding principal $ 1,975,175   $ 696,250  
Less: Debt issuance costs and issuance discounts (38,959)   (7,486)  
Less: Current portion (10,650)   (3,000)  
Long-term debt (less current portion) 1,925,566   685,764  
Fair value of long-term debt [1] 1,985,788   662,844  
2025 Senior Notes | Senior unsecured notes, due in 2025        
Components of Long-term debt        
Total outstanding principal 400,000   400,000  
Less: Debt issuance costs and issuance discounts       $ (7,000)
Senior Unsecured Notes, Due 2027 | Senior unsecured notes, due in 2025        
Components of Long-term debt        
Total outstanding principal 500,000   0  
Term Loan B, Maturing 2024        
Components of Long-term debt        
Total outstanding principal 294,000   296,250  
Term Loan B, Maturing 2026        
Components of Long-term debt        
Total outstanding principal 761,175   0  
Less: Debt issuance costs and issuance discounts   $ (23,000)    
Revolving credit facility | Amended and restated revolving credit facility        
Components of Long-term debt        
Total outstanding principal $ 20,000   $ 0  
[1] Fair values of the 2025 and 2027 Senior Notes are estimated based on quoted private market transactions and are classified as Level 1 in the fair value hierarchy. The fair values of the term loans are based on observable estimates provided by third party financial professionals, and as such, are classified within Level 2 of the fair value hierarchy.