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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
May 01, 2019
Apr. 28, 2017
Components of Long-term debt        
Total outstanding principal $ 3,332,604 $ 2,991,910    
Less: Debt issuance costs and issuance discounts (70,722) (57,939)    
Less: Current portion (18,612) (10,612)    
Net carrying value of long-term debt 3,243,270 2,923,359    
Fair value of long-term debt [1] 3,345,339 3,064,194    
Senior secured notes, due in 2029 | Senior secured debt        
Components of Long-term debt        
Total outstanding principal 550,000 550,000    
Senior unsecured notes, due in 2025 | Senior unsecured notes        
Components of Long-term debt        
Total outstanding principal 0 400,000    
Less: Debt issuance costs and issuance discounts       $ (7,000)
Senior unsecured notes, due in 2027 | Senior unsecured notes        
Components of Long-term debt        
Total outstanding principal 500,000 500,000    
Senior unsecured notes, due in 2031 | Senior unsecured notes        
Components of Long-term debt        
Total outstanding principal 500,000 500,000    
Term loan, due in 2024        
Components of Long-term debt        
Total outstanding principal 288,750 290,250    
Term loan, due in 2026        
Components of Long-term debt        
Total outstanding principal 747,854 751,660    
Less: Debt issuance costs and issuance discounts     $ (23,000)  
Term loan, due in 2028        
Components of Long-term debt        
Total outstanding principal $ 746,000 $ 0    
[1] Fair values of the 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.