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BUSINESS COMBINATIONS - Consideration Transferred For PointSource (Details) - USD ($)
$ in Thousands
Jun. 01, 2017
Dec. 31, 2019
Feb. 28, 2019
Dec. 31, 2018
Feb. 22, 2018
Dec. 31, 2017
Jun. 07, 2017
Jun. 02, 2017
Disclosure of detailed information about business combination [line items]                
Cash transferred   $ 103,978   $ 4,328   $ 21,300    
Total consideration paid net of cash and cash equivalents acquired   97,300   4,137   $ 19,149    
Other financial liabilities - current [1]   8,937   9,347        
Other financial liabilities - non current   1,617   3,418        
PointSource                
Disclosure of detailed information about business combination [line items]                
Percentage of voting equity interests acquired 100.00%              
Cash transferred $ 15,500   $ 750   $ 2,206   $ 12,400 $ 3,100
Working capital adjustment 3,756              
Contingent consideration 9,373              
Total consideration paid net of cash and cash equivalents acquired $ 28,629              
Other financial liabilities - current   1,086   746        
Other financial liabilities - non current   $ 0   $ 1,040        
[1] Includes other financial liabilities related to business combinations of 8,937 and 9,335 as of December 31, 2019 and 2018, respectively (note 25.11) and the fair value of foreign exchange forward contracts of 12 as of December 31, 2018, respectively (notes 28.10 and 28.11).