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STOCK AWARD PLANS, Employee Plan Outstanding and Exercisable Options (Details) - Employee Stock Award Plan [Member] - Stock Options [Member]
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
First Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, upper limit (in dollars per share) $ 51.23
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 83,329
Weighted Average Remaining Contractual Life 3 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 51.23
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 83,329
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 51.23
Second Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, lower limit (in dollars per share) 64.65
Range of Exercise Prices, upper limit (in dollars per share) $ 68.50
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 100,757
Weighted Average Remaining Contractual Life 5 years
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 67.34
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 45,052
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 68.47
Third Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, lower limit (in dollars per share) 70.65
Range of Exercise Prices, upper limit (in dollars per share) $ 75.50
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 307,671
Weighted Average Remaining Contractual Life 4 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 74.32
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 126,553
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 73.96
Fourth Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, lower limit (in dollars per share) 84.90
Range of Exercise Prices, upper limit (in dollars per share) $ 101.46
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 43,986
Weighted Average Remaining Contractual Life 2 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 94.38
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 37,281
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 96.08
Full Exercise Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, lower limit (in dollars per share) 51.23
Range of Exercise Prices, upper limit (in dollars per share) $ 101.46
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 535,743
Weighted Average Remaining Contractual Life 4 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 71.06
Aggregate Intrinsic Value, Options Outstanding | $ $ 4,929,000
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 292,215
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 69.45
Aggregate Intrinsic Value, Options Exercisable | $ $ 3,426,000