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REVENUE COST OF REVENUE (Tables)
12 Months Ended
Dec. 31, 2015
Revenues [Abstract]  
Schedule of revenue [Table Text Block]
The components of revenue were as follows for the years ended December 31:
(in thousands)
 
2015
 
2014
 
2013
 
 
 
 
 
 
 
Service revenue
 
$
940,920

 
$
938,679

 
$
662,059

Reimbursable expenses
 
107,344

 
137,634

 
102,478

Non-controlling interests
 
3,202

 
2,603

 
3,820

 
 
 
 
 
 
 
Total
 
$
1,051,466

 
$
1,078,916

 
$
768,357