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Debt and deferred financing costs - Schedule of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Oct. 25, 2016
Debt Instrument [Line Items]      
Total debt $ 1,270,660 $ 1,098,303  
Less: current portion debt (12,510) (12,510)  
Total long-term debt 1,258,150 1,085,793  
Senior Notes | Term Loan      
Debt Instrument [Line Items]      
Total debt 1,091,949 1,098,303 $ 1,100,000
Debt issuance costs and original issuance discount 23,281 25,055  
Revolving Line of Credit | Revolver      
Debt Instrument [Line Items]      
Total debt 178,711 $ 0  
Debt issuance costs and original issuance discount $ 1,289