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DEBT (Schedule of Outstanding Exchangeable) (Details)
1 Months Ended
Aug. 31, 2020
Rate
Jan. 31, 2017
USD ($)
$ / shares
Rate
Dec. 31, 2020
$ / shares
Aug. 30, 2020
$ / shares
Exchangeable Notes        
Debt Instrument [Line Items]        
Conversion rate effective (per $1000 principal amount)   0.012026    
2020 Exchangeable Notes        
Debt Instrument [Line Items]        
Cash coupon rate (per annum)       0.00%
Conversion rate effective (per $1000 principal amount) | Rate 334.00%      
Effective conversion price effective (per ADS) (in usd per share) | $ / shares     $ 299.19 $ 299.19
2017 Exchangeable Notes        
Debt Instrument [Line Items]        
Principal amount | $   $ 287,495,000    
Cash coupon rate (per annum)   1.25%    
Conversion rate effective (per $1000 principal amount) | Rate   1205.00%    
Effective conversion price effective (per ADS) (in usd per share) | $ / shares   $ 83.15