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FINANCIAL INSTRUMENTS - Reconciliation of Recurring Fair Value Measurements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in fair value measurement, assets [abstract]    
Assets, at beginning of period $ 437,099  
Derecognition of call option   $ 455
Assets, at end of period 687,764 437,099
Reconciliation of changes in fair value measurement, liabilities [abstract]    
Liabilities, at beginning of period 99,183  
Liabilities, at end of period 249,050 99,183
Other financial liabilities related to business combinations | Level 3 of fair value hierarchy    
Reconciliation of changes in fair value measurement, liabilities [abstract]    
Liabilities, at beginning of period 9,767 23,905
Fair value remeasurement 85 (6,700)
Reclassification to amortized cost   (1,778)
Acquisition of business 6,835 3,029
Payments (7,695) (8,947)
Interests 260 258
Liabilities, at end of period 9,252 9,767
Foreign exchange forward contracts | Level 3 of fair value hierarchy    
Reconciliation of changes in fair value measurement, liabilities [abstract]    
Liabilities, at beginning of period 0 2,797
Fair value remeasurement   (1,611)
Reclassification to amortized cost   0
Acquisition of business   0
Payments   (1,186)
Interests   0
Liabilities, at end of period   0
Convertible notes | Level 3 of fair value hierarchy    
Reconciliation of changes in fair value measurement, assets [abstract]    
Assets, at beginning of period 0  
Fair value measurement 0  
Acquisition of business 0  
Payments 3,350  
Interests 75  
Assets, at end of period 3,425 0
Call Options on Minority Interest | Level 3 of fair value hierarchy    
Reconciliation of changes in fair value measurement, assets [abstract]    
Assets, at beginning of period $ 0 455
Fair value measurement   0
Derecognition of call option   (455)
Acquisition of business   0
Payments   0
Interests   0
Assets, at end of period   $ 0