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STOCK COMPENSATION PLANS - STOCK COMPENSATION PLANS NARRATIVE (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, number of shares authorized (shares) 65,800,000    
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized $ 60,198    
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 1 year 10 months 24 days    
Intrinsic value of share-based liabilities paid, combined with the fair value of shares vested (in millions of dollars) $ 56,294 $ 51,739 $ 28,752
Deferred performance stock units, deferred restricted stock units, and directors' fees and accumulated dividend amounts representing deferred stock units outstanding 254,269    
Employee stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 1 year 3 months 18 days    
Share-based compensation arrangement by share-based payment award, expiration period 10 years    
Share-based compensation arrangement by share-based payment award, award vesting period 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 21.31 $ 15.25 $ 15.58
Intrinsic value of options exercised (in millions of dollars) $ 32,121 $ 115,786 $ 38,382
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options $ 2,138    
Performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 3 years    
Share-based compensation arrangement by share-based payment award, award vesting period 3 years    
Performance stock units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation arrangement, by share based payment award, equity instruments other than options, performance score, percentage 0.00%    
Performance stock units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation arrangement, by share based payment award, equity instruments other than options, performance score, percentage 250.00%    
Performance stock units and restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, conversion basis (shares) 1