STOCK AWARD PLANS, Director Plan Outstanding and Exercisable Options (Details) - Director 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, 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 8 months 12 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 3 months 18 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	65,828
Weighted Average Remaining Contractual Life	4 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 86.45
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	65,828
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 86.45
Full Exercise Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	29.60
Range of Exercise Prices, upper limit (in dollars per share)	$ 99.52
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	125,104
Weighted Average Remaining Contractual Life	3 years 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 72.08
Aggregate Intrinsic Value, Options Outstanding | $	$ 1,140,000
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	125,104
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 72.08
Aggregate Intrinsic Value, Options Exercisable | $	$ 1,140,000