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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Components of Long-term debt    
Long-term debt $ 1,952,522 $ 696,250
Less: Debt issuance costs and issuance discounts (37,492) (7,486)
Current portion of long-term debt (10,612) (3,000)
Long-term debt (less current portion) 1,904,418 685,764
Fair value of long-term debt [1] 1,991,164 662,844
Amended and restated revolving credit facility | Variable rate credit facility    
Components of Long-term debt    
Long-term debt 0 0
Senior 5.125% Unsecured Notes, Due 2025 | Senior unsecured notes    
Components of Long-term debt    
Long-term debt 400,000 400,000
Senior Unsecured Notes, Due 2027 | Senior unsecured notes    
Components of Long-term debt    
Long-term debt 500,000 0
Term Loan B, Maturing 2024    
Components of Long-term debt    
Long-term debt 293,250 296,250
Term Loan B-1, Maturing 2026    
Components of Long-term debt    
Long-term debt $ 759,272 $ 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.