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STOCK AWARD PLANS, Director Plan Outstanding and Exercisable Options (Details) - Director Plan [Member] - Stock Options [Member]
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
First Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, upper limit (in dollars per share) $ 29.60
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 6,000
Weighted Average Remaining Contractual Life 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 29.60
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 6,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 29.60
Second 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 2 years 2 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
Third 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 9 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
Fourth 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 5 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 86.45
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 64,508
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 86.48
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 131,104
Weighted Average Remaining Contractual Life 4 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 70.14
Aggregate Intrinsic Value, Options Outstanding | $ $ 2,114
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 129,784
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 69.98
Aggregate Intrinsic Value, Options Exercisable | $ $ 2,114