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ACQUISITIONS - Schedule of Fair Value of Intangible Assets (Details) - ACTIVE Network - USD ($)
$ in Thousands
Sep. 01, 2017
Mar. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Estimated Fair Values $ 410,545 $ 410,545 $ 410,545
Weighted-Average Estimated Amortization Periods 13 years    
Customer-related intangible assets      
Business Acquisition [Line Items]      
Estimated Fair Values $ 189,000    
Weighted-Average Estimated Amortization Periods 17 years    
Acquired technology      
Business Acquisition [Line Items]      
Estimated Fair Values $ 153,300    
Weighted-Average Estimated Amortization Periods 9 years    
Trademarks and trade names      
Business Acquisition [Line Items]      
Estimated Fair Values $ 59,400    
Weighted-Average Estimated Amortization Periods 15 years    
Covenants-not-to-compete      
Business Acquisition [Line Items]      
Estimated Fair Values $ 8,845    
Weighted-Average Estimated Amortization Periods 3 years