Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Debt (Details)

v3.19.2
Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Carrying value $ 296,923    
Term Loan      
Debt Instrument [Line Items]      
Principal outstanding 111,923 $ 114,990  
Unamortized discount (142) (171)  
Unamortized debt issuance costs (113) (137)  
Carrying value 111,668 114,682  
Term Loan | Delayed Draw Term Loan      
Debt Instrument [Line Items]      
Principal outstanding 185,000 190,000  
Unamortized discount (501) (606)  
Unamortized debt issuance costs (300) (361)  
Carrying value $ 184,199 $ 189,033 $ 200,000