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ACQUISITIONS (Details) - USD ($)
12 Months Ended
Jul. 24, 2017
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2014
Business Acquisition [Line Items]          
Goodwill   $ 2,737,671,000 $ 3,375,000,000 $ 2,396,906,000  
Deferred tax liability established as a result of identifiable intangible assets acquired   517,353,000   740,329,000  
Acquisition related costs   5,100,000      
Business Combination, Contingent Consideration, Liability         $ 10,700,000
Cash paid to settle contingent consideration     18,400,000    
Cash paid to settle contingent consideration, financing activities     10,700,000    
Cash paid to settle contingent consideration, operating activities     7,700,000    
Momondo Group [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Gross $ 555,500,000        
Current assets 49,300,000        
Identifiable intangible assets 333,300,000        
Goodwill 288,300,000        
Property and equipment 1,200,000        
Total liabilities (116,600,000)        
Purchase price, total consideration 555,500,000        
Cash Acquired from Acquisition 14,600,000        
Deferred tax liability established as a result of identifiable intangible assets acquired 70,400,000        
Debt assumed in acquisition(s) 15,100,000        
Series of Individually Immaterial Business Acquisitions          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Net of Cash Acquired     $ 75,000,000    
Business Combination, Contingent Consideration, Liability   9,000,000   $ 9,000,000  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low   0      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 90,000,000      
Supply and distribution agreements | Momondo Group [Member]          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 213,500,000        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years        
Trade names | Momondo Group [Member]          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 104,400,000        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years        
Technology | Momondo Group [Member]          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 15,400,000        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years