REVENUE (Tables)

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Schedule of revenue

The components of revenue were as follows:

	Three months ended  September 30,				Nine months ended September 30,
(in thousands)	2019		2018		2019		2018
Service revenue	$	133,781	$	196,906	$	489,300	$	594,533
Reimbursable expenses	7,213		6,815		16,484		23,970
Non-controlling interests	499		854		2,179		2,066
Total	$	141,493	$	204,575	$	507,963	$	620,569

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 September 30, 2019	$	125,939	$	8,341	$	7,213	$	141,493
Three months ended September 30, 2018	173,581		24,179		6,815		204,575
Nine months ended September 30, 2019	452,643		38,836		16,484		507,963
Nine months ended September 30, 2018	527,743		68,856		23,970		620,569