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STOCK-BASED COMPENSATION (Summary Of Restricted Stock Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]          
Outstanding (in shares) 1,649,973        
Granted (in shares) 551,860        
Vested (in shares) (671,598)        
Forfeited (in shares) (75,885)        
Outstanding (in shares) 1,649,973     1,454,350 1,649,973
Expected to vest, net of estimated forfeitures (in shares)       1,454,350  
Vested And deferred at end of period (in shares) 19,810 32,596      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Outstanding (in dollars per share) $ 121.23        
Granted (in dollars per share) 185.41        
Vested (in dollars per share) 114.49        
Forfeitures (in dollars per share) 140.81        
Outstanding (in dollars per share) $ 147.67 $ 121.23      
Expected to vest, (in dollars per share)       $ 147.67  
Vested and deferred (in dollars per share)       $ 124.03  
Vested and deferred (in shares) 19,810 32,596   19,810 32,596
PSUs          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]          
Outstanding (in shares) 624,511        
Granted (in shares) 243,077        
Vested (in shares) (338,680)        
Forfeited (in shares) 0        
Outstanding (in shares) 624,511     528,908 624,511
Expected to vest, net of estimated forfeitures (in shares)       528,908  
Vested And deferred at end of period (in shares) 0 46,500      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Outstanding (in dollars per share) $ 109.97        
Granted (in dollars per share) 147.39        
Vested (in dollars per share) 94.71        
Forfeitures (in dollars per share) 0        
Outstanding (in dollars per share) $ 136.94 $ 109.97      
Expected to vest, (in dollars per share)       $ 136.94  
Vested and deferred (in dollars per share)       $ 0  
Vesting period 3 years 3 years      
Three year performance grant, shares granted (in shares) 114,823 131,311 154,520    
Three year performance grant, shares issuable based on first, second and third years 128,254 338,680      
Vested and deferred (in shares) 0 46,500   0 46,500