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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
12 Months Ended
Dec. 31, 2020
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 62,315
Weighted Average Remaining Contractual Life 2 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 51.23
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 62,315
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 94,218
Weighted Average Remaining Contractual Life 3 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 67.26
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 63,218
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) 73.29
Range of Exercise Prices, upper limit (in dollars per share) $ 75.50
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 380,289
Weighted Average Remaining Contractual Life 4 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 74.32
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 157,176
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 74.98
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 40,695
Weighted Average Remaining Contractual Life 1 year
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 94.31
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 36,225
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 95.47
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 577,517
Weighted Average Remaining Contractual Life 3 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 72.09
Aggregate Intrinsic Value, Options Outstanding | $ $ 37,000
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 318,934
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 71.37
Aggregate Intrinsic Value, Options Exercisable | $ $ 37,000