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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of shares      
Shares/Share units potentially payable, beginning balance 236,096 261,145 252,866
Grants 65,370 96,505 118,279
Changes due to performance 14,343 (11,891) 18,779
Payments (75,545) (89,190) (88,073)
Forfeitures (12,963) (20,473) (40,706)
Shares/Share units potentially payable, ending balance 227,301 236,096 261,145
Weighted average grant date value per share      
Payments $ 62.69 $ 46.64 $ 33.20
Cash paid for share based liabilities $ 4,736 $ 4,160 $ 2,924