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LEASES - Summary of Lease Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of leases [Abstract]      
Lease liabilities $ 46,887    
Additions 23,590    
Additions from business combinations 3,347    
Foreign exchange difference (92)    
Interest expense 3,464 $ 0 $ 0
Payments (15,833)    
Lease liabilities $ 61,363 $ 46,887