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TRADE RECEIVABLES - Trade Receivables (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]      
Trade receivables [1] $ 156,676 $ 110,898  
Balances due from related parties 91 993  
Cost      
Disclosure of financial assets [line items]      
Trade receivables 160,352 114,855  
Allowance for doubtful accounts      
Disclosure of financial assets [line items]      
Trade receivables 3,676 3,957  
Accounts receivable | Cost      
Disclosure of financial assets [line items]      
Trade receivables 146,382 101,754  
Unbilled revenue | Cost      
Disclosure of financial assets [line items]      
Trade receivables 13,970 13,101  
Trade receivables      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Balance at beginning of year (3,957) (609) $ (617)
Additions (275) (3,421) 5
Write-off of receivables 556 73 3
Balance at end of year $ (3,676) $ (3,957) $ (609)
[1] Includes balances due from related parties of 91 and 993 as of December 31, 2019 and 2018, respectively. See note 23.1.