CONSOLIDATED FINANCIAL STATEMENT DETAILS (Details) - USD ($) $ in Thousands				3 Months Ended		6 Months Ended
	Dec. 08, 2016	Jun. 30, 2016	Jun. 01, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Additional Consolidated Financial Statement Details [Line Items]
Other income (expense), net				$ 10,230	$ (7,192)	$ 2,516	$ 8,705
Other Income (Expense)
Additional Consolidated Financial Statement Details [Line Items]
Gain on sale of long-term investments				21,200		21,300	3,100
Interest income				2,500	1,100	4,100	2,800
Loss on mark-to-market adjustment related to a subsidiary denominated equity award issued to a non-employee				8,000		10,600	3,400
Foreign currency exchange gain (loss)				3,600	8,600	6,200	13,100
Other-than-temporary impairment on cost method investments				$ 1,400		$ 4,800	2,700
Write off of original discount and deferred financing costs					11,100		11,100
Other Income (Expense) | Senior Notes
Additional Consolidated Financial Statement Details [Line Items]
Loss on redemption of senior notes					1,700		3,100
Disposal Group, Disposed of by Sale, Not Discontinued Operations | PriceRunner | Other Income (Expense)
Additional Consolidated Financial Statement Details [Line Items]
Gain (loss) related to sale of business							12,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | ASKfm | Other Income (Expense)
Additional Consolidated Financial Statement Details [Line Items]
Gain (loss) related to sale of business					3,700		$ 3,700
Match Group Term Loan due November 16, 2022 | Match Group, Inc. | Term Loan
Additional Consolidated Financial Statement Details [Line Items]
Repayment of debt	$ 40,000	$ 10,000	$ 400,000		$ 400,000