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EMPLOYEE BENEFITS - Summary of the share-based compensation plan (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
shares
$ / shares
Dec. 31, 2018
USD ($)
shares
$ / shares
Dec. 31, 2017
shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) $ 10,129    
Expense $ 6,288    
Number of stock options (in shares) | shares 1,051,602 1,786,467 2,155,851
Number of stock options vested (in shares) | shares 671,227    
Fair value vested ($) $ 5,100    
Deferred tax assets 26,868 $ 16,916  
Share-based compensation plan      
Disclosure of range of exercise prices of outstanding share options [line items]      
Deferred tax assets $ 11,587 $ 4,731  
Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of Restricted Stock Units (in shares) | shares 622,322    
Fair value at grant date ($) $ 39,802    
Expense $ 14,932    
Non-Employees Restricted Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of Restricted Stock Units (in shares) | shares 2,574    
Fair value at grant date ($) $ 225    
Expense $ 179    
Employee and Non Employee Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 85.80 $ 46.29  
Number of Restricted Stock Units (in shares) | shares 624,896 535,838 164,859
Fair value at grant date ($) $ 40,027    
Expense 15,111    
Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 9,881    
Expense $ 6,226    
Number of stock options (in shares) | shares 1,024,602    
Number of stock options vested (in shares) | shares 650,977    
Fair value vested ($) $ 4,914    
Non-Employees Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 248    
Expense $ 62    
Number of stock options (in shares) | shares 27,000    
Number of stock options vested (in shares) | shares 20,250    
Fair value vested ($) $ 186    
Exercise Price, $0.95 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 0    
Expense $ 5    
Exercise price ($ per share) | $ / shares $ 0.95    
Number of stock options (in shares) | shares 0    
Number of stock options vested (in shares) | shares 0    
Fair value vested ($) $ 0    
Exercise Price, $2.48 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 0    
Expense $ 9    
Exercise price ($ per share) | $ / shares $ 2.48    
Number of stock options (in shares) | shares 0    
Number of stock options vested (in shares) | shares 0    
Fair value vested ($) $ 0    
Exercise Price, $3.38 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 0    
Expense $ 85    
Exercise price ($ per share) | $ / shares $ 3.38    
Number of stock options (in shares) | shares 0    
Number of stock options vested (in shares) | shares 0    
Fair value vested ($) $ 0    
Exercise Price, $12.22 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 0    
Expense $ 0    
Exercise price ($ per share) | $ / shares $ 12.22    
Number of stock options (in shares) | shares 0    
Number of stock options vested (in shares) | shares 0    
Fair value vested ($) $ 0    
Exercise Price, $10.00 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 359    
Expense $ 500    
Exercise price ($ per share) | $ / shares $ 10.00    
Number of stock options (in shares) | shares 107,826    
Number of stock options vested (in shares) | shares 107,826    
Fair value vested ($) $ 359    
Exercise Price, $22.77 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 0    
Expense $ 0    
Exercise price ($ per share) | $ / shares $ 22.77    
Number of stock options (in shares) | shares 0    
Number of stock options vested (in shares) | shares 0    
Fair value vested ($) $ 0    
Exercise Price, $28.31 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 1,426    
Expense $ 1,422    
Exercise price ($ per share) | $ / shares $ 28.31    
Number of stock options (in shares) | shares 205,748    
Number of stock options vested (in shares) | shares 205,748    
Fair value vested ($) $ 1,426    
Exercise Price, $29.34 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 26    
Expense $ 0    
Exercise price ($ per share) | $ / shares $ 29.34    
Number of stock options (in shares) | shares 3,875    
Number of stock options vested (in shares) | shares 3,875    
Fair value vested ($) $ 26    
Exercise Price, $34.20 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 47    
Expense $ 39    
Exercise price ($ per share) | $ / shares $ 34.20    
Number of stock options (in shares) | shares 5,500    
Number of stock options vested (in shares) | shares 5,500    
Fair value vested ($) $ 47    
Exercise Price, $29.01 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 810    
Expense $ 888    
Exercise price ($ per share) | $ / shares $ 29.01    
Number of stock options (in shares) | shares 117,480    
Number of stock options vested (in shares) | shares 52,480    
Fair value vested ($) $ 362    
Exercise Price, $32.36 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 2,740    
Expense $ 1,487    
Exercise price ($ per share) | $ / shares $ 32.36    
Number of stock options (in shares) | shares 338,173    
Number of stock options vested (in shares) | shares 211,798    
Fair value vested ($) $ 1,716    
Exercise Price, $38.16 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 273    
Expense $ 91    
Exercise price ($ per share) | $ / shares $ 38.16    
Number of stock options (in shares) | shares 30,000    
Number of stock options vested (in shares) | shares 20,000    
Fair value vested ($) $ 182    
Exercise Price, $36.30 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 127    
Expense $ 32    
Exercise price ($ per share) | $ / shares $ 36.30    
Number of stock options (in shares) | shares 15,000    
Number of stock options vested (in shares) | shares 7,500    
Fair value vested ($) $ 64    
Exercise Price, $44.97 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 268    
Expense $ 118    
Exercise price ($ per share) | $ / shares $ 44.97    
Number of stock options (in shares) | shares 15,000    
Number of stock options vested (in shares) | shares 0    
Fair value vested ($) $ 0    
Exercise Price, $46.00 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 3,434    
Expense $ 1,349    
Exercise price ($ per share) | $ / shares $ 46.00    
Number of stock options (in shares) | shares 170,000    
Number of stock options vested (in shares) | shares 36,250    
Fair value vested ($) $ 732    
Exercise Price, $55.07 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 181    
Expense $ 97    
Exercise price ($ per share) | $ / shares $ 55.07    
Number of stock options (in shares) | shares 7,500    
Number of stock options vested (in shares) | shares 0    
Fair value vested ($) $ 0    
Exercise Price, $50.92 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 101    
Expense $ 61    
Exercise price ($ per share) | $ / shares $ 50.92    
Number of stock options (in shares) | shares 4,500    
Number of stock options vested (in shares) | shares 0    
Fair value vested ($) $ 0    
Exercise Price, $52.10 | Employee Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 89    
Expense $ 43    
Exercise price ($ per share) | $ / shares $ 52.10    
Number of stock options (in shares) | shares 4,000    
Number of stock options vested (in shares) | shares 0    
Fair value vested ($) $ 0    
Exercise Price, $39.37 | Non-Employees Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Fair value at grant date ($) 248    
Expense $ 62    
Exercise price ($ per share) | $ / shares $ 39.37    
Number of stock options (in shares) | shares 27,000    
Number of stock options vested (in shares) | shares 20,250    
Fair value vested ($) $ 186    
Grant Price, $36.30 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 36.30    
Number of Restricted Stock Units (in shares) | shares 1,000    
Fair value at grant date ($) $ 36    
Expense $ 18    
Grant Price, $37.00 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 37.00    
Number of Restricted Stock Units (in shares) | shares 45,242    
Fair value at grant date ($) $ 1,674    
Expense $ 2,217    
Grant Price, $42.00 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 42.00    
Number of Restricted Stock Units (in shares) | shares 3,250    
Fair value at grant date ($) $ 137    
Expense $ 77    
Grant Price, $46.00 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 46.00    
Number of Restricted Stock Units (in shares) | shares 281,180    
Fair value at grant date ($) $ 12,934    
Expense $ 5,221    
Grant Price, $46.00 | Non-Employees Restricted Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 46.00    
Number of Restricted Stock Units (in shares) | shares 0    
Fair value at grant date ($) $ 0    
Expense $ 35    
Grant Price, $50.92 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 50.92    
Number of Restricted Stock Units (in shares) | shares 7,500    
Fair value at grant date ($) $ 382    
Expense $ 129    
Grant Price, $52.74 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 52.74    
Number of Restricted Stock Units (in shares) | shares 3,000    
Fair value at grant date ($) $ 158    
Expense $ 54    
Grant Price, $55.07 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 55.07    
Number of Restricted Stock Units (in shares) | shares 3,000    
Fair value at grant date ($) $ 165    
Expense $ 56    
Grant Price, $56.87 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 56.87    
Number of Restricted Stock Units (in shares) | shares 0    
Fair value at grant date ($) $ 0    
Expense $ 67    
Grant Price, $52.10 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 52.10    
Number of Restricted Stock Units (in shares) | shares 2,400    
Fair value at grant date ($) $ 125    
Expense $ 61    
Grant Price, $87.44 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 87.44    
Number of Restricted Stock Units (in shares) | shares 268,750    
Fair value at grant date ($) $ 23,500    
Expense $ 6,450    
Grant Price, $94.93 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 94.93    
Number of Restricted Stock Units (in shares) | shares 4,000    
Fair value at grant date ($) $ 380    
Expense $ 116    
Grant Price, $69.77 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 69.77    
Number of Restricted Stock Units (in shares) | shares 0    
Fair value at grant date ($) $ 0    
Expense $ 446    
Grant Price, $103.75 | Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 103.75    
Number of Restricted Stock Units (in shares) | shares 3,000    
Fair value at grant date ($) $ 311    
Expense $ 20    
Grant Price, $57.39 | Non-Employees Restricted Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 57.39    
Number of Restricted Stock Units (in shares) | shares 0    
Fair value at grant date ($) $ 0    
Expense $ 18    
Grant Price, $87.44 | Non-Employees Restricted Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Grant price (in usd per share) | $ / shares $ 87.44    
Number of Restricted Stock Units (in shares) | shares 2,574    
Fair value at grant date ($) $ 225    
Expense $ 126