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Stockholders' Equity (Reconciliation Of Outstanding And Exercisable Stock Options) (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Stockholders' Equity [Abstract]  
Number outstanding | shares 25,404,152
Weighted average remaining contractual life 6 years 6 months 4 days
Weighted average exercise price | $ / shares $ 6.10
Number vested | shares 16,802,740
Weighted average exercise price | $ / shares $ 6.05