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STOCK AWARD PLANS, Employee Plan Outstanding and Exercisable Options (Details) - Employee Stock Award Plan [Member] - Stock Options [Member]
3 Months Ended
Mar. 31, 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 87,369
Weighted Average Remaining Contractual Life 3 years 8 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 51.23
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 87,369
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 103,201
Weighted Average Remaining Contractual Life 5 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 67.37
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 47,496
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 309,174
Weighted Average Remaining Contractual Life 5 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 74.32
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 128,056
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 73.97
Fourth Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, lower limit (in dollars per share) 93.64
Range of Exercise Prices, upper limit (in dollars per share) $ 101.46
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 38,379
Weighted Average Remaining Contractual Life 1 year 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 96.01
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 38,379
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 96.01
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 538,123
Weighted Average Remaining Contractual Life 4 years 8 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 70.79
Aggregate Intrinsic Value, Options Outstanding | $ $ 3,172,000
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 301,300
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 69.32
Aggregate Intrinsic Value, Options Exercisable | $ $ 2,562,000