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REVENUE - Changes in Contract Liability (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]    
Balance as of beginning of period $ 629,739 $ 603,687
Recognized as revenue during period from beginning balance (147,944) (141,677)
Consideration deferred during period, net 115,562 161,460
Foreign currency translation adjustment and other (418) (703)
Balance as of end of period $ 596,939 $ 622,767