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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Components of Long-term debt
Long-term debt consisted of the following:
(in thousands)
 
As of 
 March 31, 
 2019
 
As of 
 December 31, 
 2018
 
 
 
 
 
Variable rate credit facility
 
$
—

 
$
—

Senior unsecured notes
 
400,000

 
400,000

Term loan B
 
295,500

 
296,250

    Total outstanding principal
 
695,500

 
696,250

Less: Debt issuance costs
 
(7,183
)
 
(7,486
)
Less: Current portion
 
(3,000
)
 
(3,000
)
   Net carrying value of long-term debt
 
$
685,317

 
$
685,764

Fair value of long-term debt *
 
$
669,387

 
$
662,844

* Fair value of the Senior Notes is estimated based on quoted private market transactions and are classified as Level 1 in the fair value hierarchy. The fair value of the term loan B is based on observable estimates provided by third party financial professionals, and as such, is classified within Level 2 of the fair value hierarchy.