REVENUE REVENUE (Tables)

6 Months Ended

Jun. 30, 2017

Revenue [Abstract]

Schedule of revenue

The components of revenue were as follows:

	Three months ended  June 30,				Six months ended  June 30,
(in thousands)	2017		2016		2017		2016
Service revenue	$	238,107	$	241,324	$	467,946	$	475,604
Reimbursable expenses	11,891		13,783		21,920		29,237
Non-controlling interests	687		692		1,302		1,090
Total	$	250,685	$	255,799	$	491,168	$	505,931