INTANGIBLE ASSETS AND GOODWILL (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Finite-lived intangible assets
Gross Carrying Amount	$ 3,081,672		$ 3,081,672		$ 3,038,812
Accumulated Amortization	(964,397)		(964,397)		(861,989)
Net Carrying Amount	2,117,275		2,117,275		2,176,823
Amortization expense	43,000	$ 45,300	135,345	$ 129,476
Annual estimated amortization expense for intangible assets
Remainder of 2018	42,591		42,591
2019	168,473		168,473
2020	160,708		160,708
2021	154,745		154,745
2022	152,006		152,006
2023	150,007		150,007
Thereafter	1,288,745		1,288,745
Total	2,117,275		2,117,275
Goodwill:
Balance at December 31, 2017			2,737,671
Acquisition			131,583
Currency translation adjustments			(24,125)
Balance at September 30, 2018	2,845,129		2,845,129
Cash paid in business acquisition			139,386	552,805
Common stock issued in an acquisition			110,441
Non-cash investing and financing activity for an acquisition			59,690	$ 0
Restricted Shares | Prepaid Expenses and Other Current Assets
Goodwill:
Deferred compensation cost	17,000		17,000
Restricted Shares | Other Assets
Goodwill:
Deferred compensation cost	27,000		27,000
Supply and distribution agreements
Finite-lived intangible assets
Gross Carrying Amount	1,081,543		1,081,543		1,056,660
Accumulated Amortization	(396,584)		(396,584)		(355,000)
Net Carrying Amount	684,959		$ 684,959		701,660
Weighted- Average Useful Life			16 years
Technology
Finite-lived intangible assets
Gross Carrying Amount	171,419		$ 171,419		137,288
Accumulated Amortization	(118,017)		(118,017)		(104,478)
Net Carrying Amount	53,402		$ 53,402		32,810
Weighted- Average Useful Life			5 years
Patents
Finite-lived intangible assets
Gross Carrying Amount	1,623		$ 1,623		1,623
Accumulated Amortization	(1,623)		(1,623)		(1,623)
Net Carrying Amount	0		$ 0		0
Amortization Period			15 years
Weighted- Average Useful Life			15 years
Internet domain names
Finite-lived intangible assets
Gross Carrying Amount	40,903		$ 40,903		42,265
Accumulated Amortization	(29,767)		(29,767)		(28,802)
Net Carrying Amount	11,136		$ 11,136		13,463
Weighted- Average Useful Life			8 years
Trade Names
Finite-lived intangible assets
Gross Carrying Amount	1,785,284		$ 1,785,284		1,779,076
Accumulated Amortization	(417,600)		(417,600)		(350,447)
Net Carrying Amount	1,367,684		$ 1,367,684		1,428,629
Weighted- Average Useful Life			19 years
Noncompete Agreements
Finite-lived intangible assets
Gross Carrying Amount	900		$ 900		21,900
Accumulated Amortization	(806)		(806)		(21,639)
Net Carrying Amount	$ 94		$ 94		$ 261
Amortization Period			4 years
Weighted- Average Useful Life			4 years
Minimum | Supply and distribution agreements
Finite-lived intangible assets
Amortization Period			3 years
Minimum | Technology
Finite-lived intangible assets
Amortization Period			1 year
Minimum | Internet domain names
Finite-lived intangible assets
Amortization Period			5 years
Minimum | Trade Names
Finite-lived intangible assets
Amortization Period			4 years
Maximum | Supply and distribution agreements
Finite-lived intangible assets
Amortization Period			20 years
Maximum | Technology
Finite-lived intangible assets
Amortization Period			7 years
Maximum | Internet domain names
Finite-lived intangible assets
Amortization Period			20 years
Maximum | Trade Names
Finite-lived intangible assets
Amortization Period			20 years
Additional Paid-In Capital
Goodwill:
Common stock issued in an acquisition			$ 110,441
Business Acquisition [Member]
Goodwill:
Common stock issued in an acquisition			$ 50,700
OpenTable [Member]
Finite-lived intangible assets
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	13.00%		13.00%