Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Components of Long-Term Debt (Details)

v3.19.1
Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Oct. 18, 2018
Debt Instrument [Line Items]      
Unamortized debt issuance costs $ (4,511) $ (4,773)  
Total long-term debt 634,005 633,535  
Credit Agreement Borrowings      
Debt Instrument [Line Items]      
Carrying value 21,000 21,000  
Senior Second Lien Notes      
Debt Instrument [Line Items]      
Carrying value 613,005 612,535  
Principal 625,000 625,000 $ 625,000
Unamortized debt issuance costs (11,995) (12,465)  
Total long-term debt $ 613,005 $ 612,535