REVENUE REVENUE (Tables)

9 Months Ended

Sep. 30, 2016

Revenue [Abstract]

Schedule of revenue

The components of revenue were as follows:

	Three months ended  September 30,				Nine months ended  September 30,
(in thousands)	2016		2015		2016		2015
Service revenue	$	239,782	$	245,469	$	715,386	$	689,880
Reimbursable expenses	12,080		26,456		41,317		89,242
Non-controlling interests	883		851		1,973		2,457
Total	$	252,745	$	272,776	$	758,676	$	781,579