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Share-Based Compensation (Stock Options Outstanding Per Range of Exercise Prices) (Details) - Stock Options
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding (in shares) | shares 2,453,395
Options Outstanding, Weighted Average Exercise Price Per Share (USD per share) $ 21.41
Options Outstanding, Weighted Average Contractual Term 6 years 1 month 28 days
Options Exercisable, Weighted Average Exercise Price Per Share (USD per share) $ 19.14
Options Exercisable, Weighted Average Contractual Term 5 years 6 months 22 days
Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, lower price range limit (USD per share) $ 10.56
Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit (USD per share) $ 32.81
$10.56 - 12.80  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding (in shares) | shares 289,512
Options Outstanding, Weighted Average Exercise Price Per Share (USD per share) $ 11.83
Options Outstanding, Weighted Average Contractual Term 3 years 6 months
Options Exercisable, Number Exercisable (in shares) | shares 289,512
Options Exercisable, Weighted Average Exercise Price Per Share (USD per share) $ 11.83
Options Exercisable, Weighted Average Contractual Term 3 years 6 months
$10.56 - 12.80 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, lower price range limit (USD per share) $ 10.56
$10.56 - 12.80 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit (USD per share) $ 12.80
$13.20 - 16.24  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding (in shares) | shares 1,044,881
Options Outstanding, Weighted Average Exercise Price Per Share (USD per share) $ 16.20
Options Outstanding, Weighted Average Contractual Term 5 years 11 months 27 days
Options Exercisable, Number Exercisable (in shares) | shares 1,044,881
Options Exercisable, Weighted Average Exercise Price Per Share (USD per share) $ 16.20
Options Exercisable, Weighted Average Contractual Term 5 years 11 months 27 days
$13.20 - 16.24 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, lower price range limit (USD per share) $ 13.20
$13.20 - 16.24 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit (USD per share) $ 16.24
$19.97 - 21.10  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding (in shares) | shares 62,422
Options Outstanding, Weighted Average Exercise Price Per Share (USD per share) $ 20.49
Options Outstanding, Weighted Average Contractual Term 3 years 4 months 21 days
Options Exercisable, Number Exercisable (in shares) | shares 62,422
Options Exercisable, Weighted Average Exercise Price Per Share (USD per share) $ 20.49
Options Exercisable, Weighted Average Contractual Term 3 years 4 months 21 days
$19.97 - 21.10 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, lower price range limit (USD per share) $ 19.97
$19.97 - 21.10 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit (USD per share) $ 21.10
$28.43 - 32.81  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding (in shares) | shares 703,378
Options Outstanding, Weighted Average Exercise Price Per Share (USD per share) $ 31.58
Options Outstanding, Weighted Average Contractual Term 8 years 6 months 29 days
Options Exercisable, Number Exercisable (in shares) | shares 295,439
Options Exercisable, Weighted Average Exercise Price Per Share (USD per share) $ 29.88
Options Exercisable, Weighted Average Contractual Term 7 years 9 months 4 days
$28.43 - 32.81 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, lower price range limit (USD per share) $ 28.43
$28.43 - 32.81 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit (USD per share) $ 32.81
$23.78 - 25.14  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding (in shares) | shares 353,202
Options Outstanding, Weighted Average Exercise Price Per Share (USD per share) $ 24.60
Options Outstanding, Weighted Average Contractual Term 4 years 5 months 27 days
Options Exercisable, Number Exercisable (in shares) | shares 353,202
Options Exercisable, Weighted Average Exercise Price Per Share (USD per share) $ 24.60
Options Exercisable, Weighted Average Contractual Term 4 years 5 months 27 days
$23.78 - 25.14 | Minimum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, lower price range limit (USD per share) $ 23.78
$23.78 - 25.14 | Maximum  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price per share, upper price range limit (USD per share) $ 25.14