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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Components of Long-term debt
Long-term debt consisted of the following:
(in thousands)
 
As of 
 June 30, 
 2018
 
As of 
 December 31, 
 2017
 
 
 
 
 
Variable rate credit facility
 
$
—

 
$
—

Senior unsecured notes
 
400,000

 
400,000

Term loan B
 
297,750

 
299,250

Unsecured subordinated notes
 
2,656

 
2,656

    Total outstanding principal
 
700,406

 
701,906

Less: Debt issuance costs
 
(8,091
)
 
(8,631
)
Less: Current portion
 
(5,656
)
 
(5,656
)
   Net carrying value of long-term debt
 
$
686,659

 
$
687,619

Fair value of long-term debt *
 
$
679,425

 
$
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.