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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, 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 1 month 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 126,260
Weighted Average Remaining Contractual Life 4 years 8 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 67.23
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 41,146
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 67.40
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 207,156
Weighted Average Remaining Contractual Life 4 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 74.56
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 91,359
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 73.36
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 1 month 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 464,702
Weighted Average Remaining Contractual Life 4 years 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 69.85
Aggregate Intrinsic Value, Options Outstanding | $ $ 1,570,000
Options Exercisable [Abstract]  
Number Exercisable (in shares) | shares 230,254
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 70.72
Aggregate Intrinsic Value, Options Exercisable | $ $ 951,000