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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of shares      
Shares/Share units potentially payable, beginning balance 347,941 361,189 350,760
Grants 90,065 91,631 104,554
Changes due to performance 13,966 (8,793)  
Payments (167,482) (86,840) (85,902)
Forfeitures (31,624) (9,246) (8,223)
Shares/Share units potentially payable, ending balance 252,866 347,941 361,189
Weighted average grant date value per share      
Shares/Share units potentially payable, beginning balance
Grants
Changes due to performance  
Payments $ 36.08 $ 35.01 $ 32.71
Forfeitures
Shares/Share units potentially payable, ending balance
Cash paid for share based liabilities $ 6,040 $ 3,040 $ 2,810