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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
 
June 30, 2018
 
December 31, 2017
2013 Term Loan Facility outstanding principal balance
$
198,877

 
$
199,918

Less: Unamortized discount
(2,429
)
 
(2,912
)
Less: Deferred financing costs
(805
)
 
(977
)
Less: Current portion due within one year
(12,082
)
 
(2,082
)
Long-term portion
$
183,561

 
$
193,947