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Stock Award Plans, Employee Plan Outstanding and Exercisable Options (Details) - Employee Stock Award Plan [Member] - Stock Options [Member]
12 Months Ended
Dec. 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 69,254
Weighted Average Remaining Contractual Life 2 years 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 51.23
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 69,254
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 97,716
Weighted Average Remaining Contractual Life 4 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 67.31
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 44,171
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 68.43
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 275,103
Weighted Average Remaining Contractual Life 4 years 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 74.69
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 93,985
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 74.94
Fourth Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, lower limit (in dollars per share) 84.90
Range of Exercise Prices, upper limit (in dollars per share) $ 101.46
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 43,986
Weighted Average Remaining Contractual Life 1 year 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 94.38
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 37,281
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 96.08
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 486,059
Weighted Average Remaining Contractual Life 4 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 71.65
Aggregate Intrinsic Value, Options Outstanding | $ $ 8,936,000
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 244,691
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 70.28
Aggregate Intrinsic Value, Options Exercisable | $ $ 4,955,000