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Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Accrued expenses $ 42,335 $ 44,711
Derivative instruments 2,046 3,204
Client liabilities 6,632 6,933
Other current liabilities 14,814 9,321
Accrued expenses and other current liabilities $ 65,827 $ 64,169