REVENUE REVENUE (Tables)

9 Months Ended

Sep. 30, 2017

Revenue [Abstract]

Schedule of revenue

The components of revenue were as follows:

	Three months ended  September 30,				Nine months ended  September 30,
(in thousands)	2017		2016		2017		2016
Service revenue	$	224,308	$	239,782	$	692,254	$	715,386
Reimbursable expenses	9,866		12,080		31,786		41,317
Non-controlling interests	805		883		2,107		1,973
Total	$	234,979	$	252,745	$	726,147	$	758,676