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Share-Based Compensation Plan (Stock Options Outstanding Per Range of Exercise Prices) (Details) - Stock Options [Member]
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding | shares 1,054,739
Options Outstanding, Weighted Average Exercise Price Per Share $ 25.38
Options Outstanding, Weighted Average Contractual Term 6 years 4 months 16 days
Options Exercisable, Weighted Average Exercise Price Per Share $ 22.58
Options Exercisable, Weighted Average Contractual Term 4 years 8 months 5 days
Minimum [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, lower price range limit $ 10.56
Maximum [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit $ 30.18
Range of Exercise Prices Per Share, $19.43 - 21.10 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding | shares 84,775
Options Outstanding, Weighted Average Exercise Price Per Share $ 13.31
Options Outstanding, Weighted Average Contractual Term 4 years 8 months 24 days
Options Exercisable, Number Exercisable | shares 84,775
Options Exercisable, Weighted Average Exercise Price Per Share $ 13.31
Options Exercisable, Weighted Average Contractual Term 4 years 8 months 24 days
Range of Exercise Prices Per Share, $19.43 - 21.10 [Member] | Minimum [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, lower price range limit $ 10.56
Range of Exercise Prices Per Share, $19.43 - 21.10 [Member] | Maximum [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit $ 15.84
Range of Exercise Prices Per Share, $23.78 - 25.14 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding | shares 74,189
Options Outstanding, Weighted Average Exercise Price Per Share $ 20.47
Options Outstanding, Weighted Average Contractual Term 4 years 4 months 24 days
Options Exercisable, Number Exercisable | shares 74,189
Options Exercisable, Weighted Average Exercise Price Per Share $ 20.47
Options Exercisable, Weighted Average Contractual Term 4 years 4 months 24 days
Range of Exercise Prices Per Share, $23.78 - 25.14 [Member] | Minimum [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, lower price range limit $ 19.97
Range of Exercise Prices Per Share, $23.78 - 25.14 [Member] | Maximum [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit $ 21.10
Range of Exercise Prices Per Share, $29.45 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding | shares 502,845
Options Outstanding, Weighted Average Exercise Price Per Share $ 24.63
Options Outstanding, Weighted Average Contractual Term 5 years 30 days
Options Exercisable, Number Exercisable | shares 384,912
Options Exercisable, Weighted Average Exercise Price Per Share $ 24.47
Options Exercisable, Weighted Average Contractual Term 4 years 5 months 8 days
Range of Exercise Prices Per Share, $29.45 [Member] | Minimum [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit $ 23.78
Range of Exercise Prices Per Share, $29.45 [Member] | Maximum [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit $ 25.14
Range of Exercise Prices Per Share, $32.28 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding | shares 392,930
Options Outstanding, Weighted Average Exercise Price Per Share $ 29.88
Options Outstanding, Weighted Average Contractual Term 8 years 9 months 4 days
Options Exercisable, Number Exercisable | shares 31,108
Options Exercisable, Weighted Average Exercise Price Per Share $ 29.45
Options Exercisable, Weighted Average Contractual Term 8 years 2 months 1 day
Range of Exercise Prices Per Share, $32.28 [Member] | Minimum [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit $ 29.45
Range of Exercise Prices Per Share, $32.28 [Member] | Maximum [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit $ 30.18