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STOCK AWARD PLANS, Director Plan Outstanding and Exercisable Options (Details) - Director 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, lower limit (in dollars per share) $ 41.24
Range of Exercise Prices, upper limit (in dollars per share) $ 56.45
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 31,276
Weighted Average Remaining Contractual Life 1 year 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 50.61
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 31,276
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 50.61
Second Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, lower limit (in dollars per share) 61.89
Range of Exercise Prices, upper limit (in dollars per share) $ 62.48
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 28,000
Weighted Average Remaining Contractual Life 3 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 62.27
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 28,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 62.27
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) $ 99.52
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 68,480
Weighted Average Remaining Contractual Life 4 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 86.39
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 66,491
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 86.44
Full Exercise Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, lower limit (in dollars per share) 41.24
Range of Exercise Prices, upper limit (in dollars per share) $ 99.52
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 127,756
Weighted Average Remaining Contractual Life 3 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 72.35
Aggregate Intrinsic Value, Options Outstanding | $ $ 1,498,000
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 125,767
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 72.15
Aggregate Intrinsic Value, Options Exercisable | $ $ 1,498,000