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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Components of Long-term debt    
Long-term debt $ 2,991,910,000 $ 1,952,522,000
Less: Debt issuance costs and issuance discounts (57,939,000) (37,492,000)
Current portion of long-term debt (10,612,000) (10,612,000)
Net carrying value of long-term debt 2,923,359,000 1,904,418,000
Fair value of long-term debt [1] 3,064,194,000 1,991,164,000
Revolving credit facility | Variable rate credit facility    
Components of Long-term debt    
Long-term debt 0 0
Senior secured notes, due in 2029 | Senior unsecured notes    
Components of Long-term debt    
Long-term debt 550,000,000 0
Senior unsecured notes, due in 2025 | Senior unsecured notes    
Components of Long-term debt    
Long-term debt 400,000,000 400,000,000
Senior unsecured notes, due in 2027 | Senior unsecured notes    
Components of Long-term debt    
Long-term debt 500,000,000 500,000,000
Senior unsecured notes, due in 2031 | Senior unsecured notes    
Components of Long-term debt    
Long-term debt 500,000,000 0
Term loan, due in 2024    
Components of Long-term debt    
Long-term debt 290,250,000 293,250,000
Term loan, due in 2026    
Components of Long-term debt    
Long-term debt $ 751,660,000 $ 759,272,000
[1] * Fair values of the 2025, 2027, 2029 and 2031 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.