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ACQUISITIONS - Narrative (Details) - ACTIVE Network - USD ($) $ in Thousands				6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Sep. 01, 2017	Jun. 30, 2018
Business Acquisition [Line Items]
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	$ 784,526	$ 784,668		$ 784,500
Expected tax deductible amount of goodwill (as a percent)				80.00%
Amortization period of intangible assets			13 years

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Business Acquisition, Goodwill, Expected Tax Deductible Amount, Percent

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