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FAIR VALUE MEASUREMENTS Equity investments without readily determinable fair values and derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Sep. 12, 2016
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Fair Value Disclosures [Abstract]                  
Investment in equity securities $ 450,900   $ 450,900            
Investment in equity securities         $ 450,900        
Derivatives Not Designated as Hedging Instruments                  
Foreign currency gains (losses), net of derivative activity (11,800) $ 5,100 (17,200) $ 11,000          
Foreign Currency Contracts, Translation Risk                  
Derivatives Not Designated as Hedging Instruments                  
Foreign currency derivative instruments not designated as hedging instruments at fair value, net 0   0   0        
Foreign Currency Contracts, Transaction Risk                  
Derivatives Not Designated as Hedging Instruments                  
Foreign currency gains (losses) recorded in foreign currency transactions and other (50,200) $ 20,800 (29,600) 27,600          
Foreign Currency Contracts                  
Derivatives Not Designated as Hedging Instruments                  
Payments for Derivative Instrument Operating Activities     30,200            
Net cash inflow from settlement of derivative contracts included in operating activities       $ 23,100          
Ctrip.com International, Ltd. | Convertible debt securities | Long-term Investments                  
Derivatives Not Designated as Hedging Instruments                  
Cost of Ctrip convertible notes 1,275,000   1,275,000     $ 25,000 $ 500,000 $ 250,000 $ 500,000
Embedded derivative, fair value of embedded derivative $ 1,700   $ 1,700   $ 1,800