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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 12, 2016
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Derivatives Not Designated as Hedging Instruments              
Foreign exchange gains (losses), net of derivative activity $ (27,200) $ (13,900) $ (13,800)        
Derivatives Designated as Hedging Instruments              
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net 0 0          
Proceeds from foreign currency contracts 0   453,818        
Foreign Exchange Contracts, Translation Risk              
Derivatives Not Designated as Hedging Instruments              
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net 0 0          
Foreign exchange gains (losses) recorded in "Foreign currency transactions and other" (2,800) 3,400 (6,600)        
Foreign Exchange Contracts, Transaction Risk              
Derivatives Not Designated as Hedging Instruments              
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net 1,600 (300)          
Foreign exchange gains (losses) recorded in "Foreign currency transactions and other" 45,400 (15,800) (15,300)        
Foreign exchange derivative assets recorded in "Prepaid expenses and other current assets" 1,700 700          
Foreign exchange derivative liabilities recorded in "Accrued expenses and other current liabilities" 100 1,000          
Foreign exchange derivatives              
Derivatives Not Designated as Hedging Instruments              
Proceeds for Derivative Instrument Operating Activities 41,200 4,500          
Payments for Derivative Instrument Operating Activities     33,900        
Derivatives Designated as Hedging Instruments              
Proceeds from foreign currency contracts     $ 5,200        
Long-term Investments              
Derivatives Designated as Hedging Instruments              
Ctrip convertible notes 10,072,468 9,407,136          
Ctrip.com International, Ltd.              
Derivatives Designated as Hedging Instruments              
Gain (Loss) on embedded derivative, net   1,100          
Ctrip.com International, Ltd. | Ctrip convertible debt securities | Long-term Investments              
Derivatives Designated as Hedging Instruments              
Ctrip convertible notes 1,275,000 1,275,000   $ 25,000 $ 500,000 $ 250,000 $ 500,000
Embedded derivative fair value $ 1,800 $ 1,800