Debt and deferred financing costs - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Term Loan, net of debt issuance costs and original issuance discount of $21,419 and $25,055, respectively	$ 1,080,192	$ 1,098,303
Less: current portion debt	(12,510)	(12,510)
Total long-term debt	1,067,682	1,085,793
Senior Notes | Term Loan
Debt Instrument [Line Items]
Term Loan, net of debt issuance costs and original issuance discount of $21,419 and $25,055, respectively	1,080,192	1,098,303
Debt issuance costs and original issuance discount	$ 21,419	$ 25,055