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SHARE CAPITAL Narrative (Details) - USD ($)
9 Months Ended
Oct. 29, 2020
Sep. 30, 2020
Sep. 30, 2019
Oct. 28, 2020
Mar. 26, 2020
Dec. 31, 2019
Aug. 07, 2018
Senior Unsecured Convertible Notes | Senior Notes              
Class of Stock [Line Items]              
Debt instrument, amount authorized for repurchase (up to)         $ 25,000,000.0    
Debt interest rate             4.00%
Convertible debt, amount   $ 25,000,000.0         $ 100,000,000.0
Common Class A              
Class of Stock [Line Items]              
Number of shares authorized for issuance (in shares)         5,000,000.0    
Number of shares available for grant (in shares)   293,939       555,805  
Repurchase of ordinary shares (in shares)   1,874,419 0        
Stock repurchase program, remaining number of shares to be repurchased (in shares)   3,100,000          
Ordinary share capital, par value (in dollars per share)   $ 0.10       $ 0.10  
Common Class A | Subsequent Event              
Class of Stock [Line Items]              
Number of shares authorized for issuance period increase (in shares) 3,000,000.0            
Number of shares authorized for issuance (in shares) 8,000,000.0     5,000,000.0      
Common Class B              
Class of Stock [Line Items]              
Repurchase of ordinary shares (in shares)   0 0        
Ordinary share capital, par value (in dollars per share)   $ 0.10       $ 0.10