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Debt (Tables)
 3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Schedule of debt
Long-term debt as of March 31, 2019 and December 31, 2018 consists of the following:
(in thousands)
March 31, 
 2019
 
December 31, 
 2018
Senior secured notes, due 2024
$
350,000

 
$
350,000

Revolving credit agreement
—

 
—

 
350,000

 
350,000

Unamortized debt issuance costs related to senior secured notes
(4,595
)
 
(4,803
)
 
345,405

 
345,197

Less: Current portion of long-term debt
—

 
—

 
$
345,405

 
$
345,197