REVENUE (Tables)

12 Months Ended

Dec. 31, 2020

Revenues [Abstract]

Schedule of revenue

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

(in thousands)	2020		2019		2018
Service revenue	$	347,313	$	621,866	$	805,480
Reimbursable expenses	16,285		24,172		30,039
Non-controlling interests	1,949		2,613		2,683
Total	$	365,547	$	648,651	$	838,202

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, 2020	$	332,084	$	17,178	$	16,285	$	365,547
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