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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
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) $ 56.45
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 13,276
Weighted Average Remaining Contractual Life 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 56.45
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 13,276
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 56.45
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 22,000
Weighted Average Remaining Contractual Life 1 year 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 62.21
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 22,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 62.21
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 68,480
Weighted Average Remaining Contractual Life 3 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 86.39
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 68,480
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 86.39
Full Exercise Price Range [Member]  
Outstanding and Exercisable Stock options [Abstract]  
Range of Exercise Prices, lower limit (in dollars per share) 56.45
Range of Exercise Prices, upper limit (in dollars per share) $ 99.52
Options Outstanding [Abstract]  
Number Outstanding (in shares) | shares 103,756
Weighted Average Remaining Contractual Life 2 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 77.44
Aggregate Intrinsic Value, Options Outstanding | $ $ 0
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 103,756
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 77.44
Aggregate Intrinsic Value, Options Exercisable | $ $ 0