INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2017
Income Tax Contingency [Line Items]
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent		$ 41,300	$ 23,700
International pre-tax income		4,500,000	3,700,000	$ 3,100,000
Domestic pre-tax income		(121,600)	(983,100)	35,400
Impairment of goodwill		0	940,700	$ 0
Transition tax for accumulated foreign earnings, provisional income tax expense (benefit)		1,600,000
Provisional undistributed accumulated earnings of foreign subsidiary		16,500,000
Change In tax rate, deferred tax, provisional income tax expense (benefit)		217,000
Transition Tax for Accumulated Foreign Earnings, Provisional Usage of Net Operating Losses		204,000
Transition Tax for Accumulated Foreign Earnings, Provisional Usage of Tax Credit Carryforwards		46,000
Transition tax for accumulated foreign earnings, provisional liability		1,300,000
Valuation allowance on deferred tax assets		43,694	24,475
Deferred tax valuation allowance increase/(decrease)		19,200
Cumulative effect of adoption of accounting standard updates		$ 280,240
Federal
Income Tax Contingency [Line Items]
Statutory rate (as a percent)		35.00%
Operating loss carryforwards		$ 180,000
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Operating loss carryforwards		510,000
Foreign Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards		180,000
Valuation allowance on deferred tax assets		$ 26,800
OpenTable
Income Tax Contingency [Line Items]
Impairment of goodwill	$ 940,700		$ 940,700
Plan | Federal
Income Tax Contingency [Line Items]
Statutory rate (as a percent)		21.00%
Geographic Distribution, Foreign
Income Tax Contingency [Line Items]
International cash and investments		$ 16,200,000
Expiration Period between, December 31, 2019 and December 31, 2024 [Member] | Foreign Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards		86,000
Research Tax Credit Carryforward | Domestic Tax Authority
Income Tax Contingency [Line Items]
Tax credit carryforward		18,000
Research credit, capital loss carryforward and state net operating losses [Member] | Domestic Tax Authority
Income Tax Contingency [Line Items]
Valuation allowance on deferred tax assets		16,900
Retained Earnings
Income Tax Contingency [Line Items]
Cumulative effect of adoption of accounting standard updates		$ 271,252
Retained Earnings | Accounting Standards Update 2016-09 | Accounting Standards Update 2016-09, Unrecognized Equity Deductions component
Income Tax Contingency [Line Items]
Cumulative effect of adoption of accounting standard updates					$ 301,400