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GOODWILL AND INTANGIBLE ASSETS - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 891,797 $ 883,960 $ 894,709
Intangible assets with indefinite lives 171,888 171,599  
Intangible assets with definite lives, net of accumulated amortization 37,829 80,126  
Total goodwill and intangible assets, net $ 1,101,514 $ 1,135,685