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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Components of Long-term debt
Long-term debt consisted of the following:
 
 
As of December 31,
(in thousands)
 
2018
 
2017
 
 
 
 
 
Variable rate credit facility
 
$
—

 
$
—

Senior unsecured notes
 
400,000

 
400,000

Term loan B
 
296,250

 
299,250

Unsecured subordinated notes
 
—

 
2,656

     Total outstanding principal
 
696,250

 
701,906

Less: Debt issuance costs
 
(7,486
)
 
(8,631
)
Less: Current portion
 
(3,000
)
 
(5,656
)
     Net carrying value of long-term debt
 
685,764

 
687,619

Fair value of long-term debt *
 
$
662,844

 
$
703,572

* Fair value of the Senior Notes and the term loan B were estimated based on quoted private market transactions and are classified as Level 1 in the fair value hierarchy. The fair value of the unsecured subordinated notes is determined based on a discounted cash flow analysis using current market interest rates of comparable instruments and is classified as Level 2 in the fair value hierarchy.