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STOCK AWARD PLANS, Employee Plan Outstanding and Exercisable Options (Details) - Employee Stock Award Plan [Member] - Stock Options [Member]
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 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) $ 51.23
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 90,975
Weighted Average Remaining Contractual Life 4 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 57,438
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 129,430
Weighted Average Remaining Contractual Life 5 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 67.18
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 43,905
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 67.27
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) $ 75.50
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 208,154
Weighted Average Remaining Contractual Life 5 years
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 74.54
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 92,357
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 73.33
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 40,311
Weighted Average Remaining Contractual Life 2 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 95.90
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 40,311
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 95.90
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 468,870
Weighted Average Remaining Contractual Life 4 years 8 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 69.82
Aggregate Intrinsic Value, Options Outstanding | $ $ 6,956
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 234,011
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 70.66
Aggregate Intrinsic Value, Options Exercisable | $ $ 3,525