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Stock Options And Restricted Stock Awards (Weighted-Average Estimated Fair Value of Employee Stock Options Granted) (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average fair value $ 9.32 $ 9.18 $ 10.69
Risk-free discount rate, minimum 1.70%   2.12%
Risk-free discount rate   2.29%  
Risk-free discount rate, maximum 2.02%   2.73%
Expected life 8 years 2 months 12 days 8 years 2 months 12 days  
Volatility 47.00% 47.00% 47.00%
Expected turn-over rate 2.00% 2.00% 5.00%
Expected exercise multiple $ 2.2 $ 2.2 $ 2.2
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life   7 years 8 months 12 days  
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life   8 years 2 months 12 days 8 years 2 months 12 days