REVENUE (Tables)

6 Months Ended

Jun. 30, 2019

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)	2019		2018		2019		2018
Service revenue	$	190,520	$	208,861	$	355,519	$	397,627
Reimbursable expenses	4,775		9,008		9,271		17,155
Non-controlling interests	1,240		687		1,680		1,212
Total	$	196,535	$	218,556	$	366,470	$	415,994

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, 2019	$	178,949	$	12,811	$	4,775	$	196,535
Three months ended June 30, 2018	187,206		22,342		9,008		218,556
Six months ended June 30, 2019	326,704		30,495		9,271		366,470
Six months ended June 30, 2018	354,162		44,677		17,155		415,994