REVENUE (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of revenue

The components of revenue were as follows for the three months endedMarch 31:

(in thousands)	2019		2018
Service revenue	$	164,999	$	188,766
Reimbursable expenses	4,496		8,147
Non-controlling interests	440		525
Total	$	169,935	$	197,438

Disaggregation of revenue

Disaggregation of total revenues by major source is as follows:

(in thousands)	Revenue recognized when services are performed or assets are sold		Revenue related to technology platforms and professional services		Reimbursable expenses revenue		Total revenue
Three months ended March 31, 2019	$	147,755	$	17,684	$	4,496	$	169,935
Three months ended March 31, 2018	166,956		22,335		8,147		197,438