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Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Our debt consists of the following (amounts in thousands):
 
December 31, 2017
 
December 31, 2016
Senior secured term loan
$
175,000

 
$
—

Senior secured revolving credit facility
—

 
46,000

Senior notes
300,000

 
300,000

 
475,000

 
346,000

Less unamortized discount (based on imputed interest rate of 10.44%)
(3,387
)
 
—

Less unamortized debt issuance costs
(9,948
)
 
(6,527
)
 
$
461,665

 
$
339,473