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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of shares      
Shares/Share units potentially payable, beginning balance 252,866 347,941 361,189
Grants 118,279 90,065 91,631
Changes due to performance 18,779 13,966 (8,793)
Payments (88,073) (167,482) (86,840)
Forfeitures (40,706) (31,624) (9,246)
Shares/Share units potentially payable, ending balance 261,145 252,866 347,941
Weighted average grant date value per share      
Payments $ 33.20 $ 36.08 $ 35.01
Cash paid for share based liabilities $ 2,924 $ 6,040 $ 3,040