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BUSINESS ACQUISITIONS - MPI Research Pro Forma Information (Details) - MPI Research $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Business Acquisition [Line Items]
Revenue	$ 556,091
Net income attributable to common shareholders	$ 49,414

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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-Subparagraph (h)(2)
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