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Stock-Based Compensation (Calculation And Assumptions Utilized In Calculation Of Fair Values Of Options Granted) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
[1]
Dec. 31, 2014
[1]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Aggregate grant date fair value $ 1.4 $ 0.9 $ 0.1
Weighted-average per share grant date fair value (in dollars per share) $ 10.79 $ 10.06 $ 7.30
Risk-free interest rate 2.20% 2.10% 2.10%
Expected life in years 7 years 11 months 7 years 6 months 6 years
Expected volatility (over expected life) 30.00% 30.50% 35.10%
Expected dividend yield (over expected life) 3.00% 3.00% 3.90%
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