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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
May 01, 2019
Dec. 31, 2018
Components of Long-term debt      
Total outstanding principal $ 1,577,838   $ 696,250
Less: Debt issuance costs and issuance discounts (29,339)   (7,486)
Less: Current portion (10,650)   (3,000)
Long-term debt (less current portion) 1,537,849   685,764
Fair value of long-term debt [1] 1,437,995   662,844
Senior unsecured notes, due in 2025      
Components of Long-term debt      
Total outstanding principal 400,000   400,000
Term Loan B, Maturing 2024      
Components of Long-term debt      
Total outstanding principal 294,750   296,250
Term Loan B, Maturing 2026      
Components of Long-term debt      
Total outstanding principal $ 763,088   $ 0
Less: Debt issuance costs and issuance discounts   $ (23,000)  
[1] Fair value of the 2025 Senior Notes is estimated based on quoted private market transactions and is 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.