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ACQUISITIONS - Narrative (Details) - ACTIVE Network - USD ($) $ in Thousands				3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 01, 2017	Mar. 31, 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	$ 785,330	$ 784,668		$ 785,300
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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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