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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Components of long-term debt
Long-term debt consisted of the following:
(in thousands)As of 
June 30, 
2021		As of 
December 31, 
2020
Revolving credit facility$— $— 
Senior secured notes, due in 2029550,000 550,000 
Senior unsecured notes, due in 2025— 400,000 
Senior unsecured notes, due in 2027500,000 500,000 
Senior unsecured notes, due in 2031500,000 500,000 
Term loan, due in 2024288,750 290,250 
Term loan, due in 2026747,854 751,660 
Term loan, due in 2028746,000 — 
    Total outstanding principal3,332,604 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 *$3,345,339 $3,064,194 
* 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.