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Borrowings - Schedule of term loans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Aug. 31, 2017
Debt Instrument [Line Items]            
Term loan, face value $ 399,000   $ 399,000   $ 349,125  
Unamortized debt discount (4,037)   (4,037)   (3,321)  
Unamortized debt issuance costs (6,984)   (6,984)   (7,541)  
Term loan 387,979   387,979   $ 338,263  
Amortization of debt issuance costs     840 $ 75    
Term loan            
Debt Instrument [Line Items]            
Amortization of debt discount 155 $ 0 283 0    
Amortization of debt issuance costs 268 $ 0 $ 557 $ 0    
Term loan | Original term loan            
Debt Instrument [Line Items]            
Unamortized debt discount           $ (3,500)
Unamortized debt issuance costs           $ (7,949)
Quarterly amortization rate     0.25%      
Term loan | Modified term loan            
Debt Instrument [Line Items]            
Quarterly amortization rate     0.25%      
Principal repayments expected to be made in the next year 4,000   $ 4,000      
Principal repayments expected to be made in year two 4,000   4,000      
Principal repayments expected to be made in year three 4,000   4,000      
Principal repayments expected to be made in year four 4,000   4,000      
Principal repayments expected to be made in year five $ 4,000   $ 4,000