REVENUE REVENUE (Tables)

6 Months Ended

Jun. 30, 2016

Revenue [Abstract]

Schedule of revenue

The components of revenue were as follows:

	Three months ended   June 30,				Six months ended   June 30,
(in thousands)	2016		2015		2016		2015
Service revenue	$	241,324	$	236,595	$	475,604	$	444,411
Reimbursable expenses	13,783		30,830		29,237		62,786
Non-controlling interests	692		896		1,090		1,606
Total	$	255,799	$	268,321	$	505,931	$	508,803