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Stock Incentive Plans (Summary Information Pertaining to Options Outstanding) (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding | shares 152,118
Weighted-Average Remaining Contractual Life 2 years 4 months 24 days
Weighted Average Exercise Price $ 25.36
Options Exercisable | shares 145,868
Weighted-Average Exercise Price $ 25.72
$11.74 to 20.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Minimum 11.74
Exercise Price, Maximum $ 20.00
Options Outstanding | shares 45,764
Weighted-Average Remaining Contractual Life 4 years 6 months
Weighted Average Exercise Price $ 17.17
Options Exercisable | shares 39,514
Weighted-Average Exercise Price $ 17.22
$20.01 to 30.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Minimum 20.01
Exercise Price, Maximum $ 30.00
Options Outstanding | shares 58,514
Weighted-Average Remaining Contractual Life 2 years 2 months 12 days
Weighted Average Exercise Price $ 24.83
Options Exercisable | shares 58,514
Weighted-Average Exercise Price $ 24.83
$30.01 to 36.74 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Minimum 30.01
Exercise Price, Maximum $ 36.74
Options Outstanding | shares 47,840
Weighted-Average Remaining Contractual Life 7 months 6 days
Weighted Average Exercise Price $ 33.83
Options Exercisable | shares 47,840
Weighted-Average Exercise Price $ 33.83