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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Components of Long-term debt
Long-term debt consisted of the following:
(in thousands)
 
As of 
 June 30, 
 2019
 
As of 
 December 31, 
 2018
 
 
 
 
 
Revolving credit facility
 
$
120,000

 
$
—

Senior unsecured notes, due in 2025
 
400,000

 
400,000

Term loan B
 
294,750

 
296,250

Term loan B-1
 
763,088

 
—

    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
)
   Net carrying value of long-term debt
 
$
1,537,849

 
$
685,764

Fair value of long-term debt *
 
$
1,437,995

 
$
662,844

* 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.