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GOODWILL AND INTANGIBLE ASSETS - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 883,960 $ 894,709 $ 770,226
Intangible assets with indefinite lives 171,599 171,486  
Intangible assets with definite lives, net of accumulated amortization 80,126 132,809  
Total goodwill and intangible assets, net $ 1,135,685 $ 1,199,004