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Stock Options and Incentive Plans (Schedules of Other Share-based Compensation Activity) (Details) - Restricted Stock [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of shares      
Shares/Share units potentially payable, beginning balance 227,301 236,096 261,145
Grants 58,878 65,370 96,505
Changes due to performance 21,740 14,343 (11,891)
Payments (69,912) (75,545) (89,190)
Forfeitures (22,935) (12,963) (20,473)
Shares/Share units potentially payable, ending balance 215,072 227,301 236,096
Weighted average grant date value per share      
Payments $ 70.67 $ 62.69 $ 46.64
Cash paid for share based liabilities $ 5,528 $ 4,736 $ 4,160