REVENUE (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Schedule of revenue

The components of revenue were as follows:

	Three months ended  June 30,				Six months ended  June 30,
(in thousands)	2020		2019		2020		2019
Service revenue	$	91,008	$	190,520	$	204,184	$	355,519
Reimbursable expenses	3,840		4,775		11,685		9,271
Non-controlling interests	494		1,240		917		1,680
Total	$	95,342	$	196,535	$	216,786	$	366,470

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 June 30, 2020	$	87,447	$	4,055	$	3,840	$	95,342
Three months ended June 30, 2019	178,949		12,811		4,775		196,535
Six months ended June 30, 2020	195,455		9,646		11,685		216,786
Six months ended June 30, 2019	326,704		30,495		9,271		366,470