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RELATED PARTIES BALANCES AND TRANSCATIONS - Compensation of Key Management Personnel (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
shares
$ / shares
Dec. 31, 2018
USD ($)
shares
$ / shares
Dec. 31, 2017
USD ($)
shares
$ / shares
Disclosure of transactions between related parties [line items]      
Amount incurred by entity for provision of key management personnel services provided by separate management entity | $ $ 6,914 $ 5,140 $ 4,507
Key management personnel compensation | $ $ 6,914 $ 5,140 $ 4,507
Number of share options granted in share-based payment arrangement (in shares) | shares 4,000 221,000  
Options granted during the year (in usd per share) | $ / shares $ 52.10 $ 46.45  
Grant One      
Disclosure of transactions between related parties [line items]      
Number of share options granted in share-based payment arrangement (in shares) | shares   115,000  
Options granted during the year (in usd per share) | $ / shares   $ 46.00  
Grant Two      
Disclosure of transactions between related parties [line items]      
Number of share options granted in share-based payment arrangement (in shares) | shares   6,000  
Options granted during the year (in usd per share) | $ / shares   $ 50.92  
Restricted Stock Units | Grant One      
Disclosure of transactions between related parties [line items]      
Number of share options granted in share-based payment arrangement (in shares) | shares 82,800 93,000 12,836
Options granted during the year (in usd per share) | $ / shares $ 87.44 $ 46.00 $ 34.96
Restricted Stock Units | Grant Two      
Disclosure of transactions between related parties [line items]      
Number of share options granted in share-based payment arrangement (in shares) | shares 2,400 10,000 62,162
Options granted during the year (in usd per share) | $ / shares $ 52.10 $ 50.92 $ 37.00
Restricted Stock Units | Grant Three      
Disclosure of transactions between related parties [line items]      
Number of share options granted in share-based payment arrangement (in shares) | shares 2,390 4,054  
Options granted during the year (in usd per share) | $ / shares $ 69.77 $ 45.50