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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