REVENUE Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Schedule of revenue [Line Items]
Revenue	$ 240,483	$ 250,132
Service revenue
Schedule of revenue [Line Items]
Revenue	229,839	234,280
Reimbursable expenses
Schedule of revenue [Line Items]
Revenue	10,029	15,454
Non-controlling interests
Schedule of revenue [Line Items]
Revenue	$ 615	$ 398

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration