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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands					9 Months Ended
	Sep. 04, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 01, 2017	Sep. 30, 2018
Business Acquisition [Line Items]
Goodwill acquired					$ 468,798
AdvancedMD
Business Acquisition [Line Items]
Cash consideration to acquire business	$ 700,000
Unallocated provisional estimated goodwill acquired unlikely to be deductible for income tax purposes	$ 469,000
ACTIVE Network
Business Acquisition [Line Items]
Cash consideration to acquire business				$ 599,497
Total purchase consideration		$ 1,171,576	$ 1,171,576	$ 1,171,576
Number of shares issued as consideration (shares)				6,357,509.00
Goodwill acquired		$ 784,244	$ 784,668		$ 784,200
Expected tax deductible amount of goodwill (as a percent)					80.00%

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