REVENUE (Tables)

12 Months Ended

Dec. 31, 2019

Revenues [Abstract]

Schedule of revenue

The components of revenue were as follows for the years ended December 31:

(in thousands)	2019		2018		2017
Service revenue	$	621,866	$	805,480	$	899,561
Reimbursable expenses	24,172		30,039		39,912
Non-controlling interests	2,613		2,683		2,740
Total	$	648,651	$	838,202	$	942,213

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
For the year ended December 31, 2019	$	579,929	$	44,550	$	24,172	$	648,651
For the year ended December 31, 2018	719,739		88,424		30,039		838,202