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Share-Based Compensation Schedule Of Stock Option Transactions (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at beginning of period | shares 2,354,277
Options canceled | shares (202,235)
Outstanding at end of period | shares 2,152,042
Options exercisable, shares | shares 1,743,963
Unvested options, shares | shares 408,079
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average exercise price, beginning of year | $ / shares $ 23.62
Weighted average exercise price, canceled in period | $ / shares 39.07
Weighted average exercise price, end of year | $ / shares 22.17
Options exercisable, weighted average exercise price | $ / shares 23.96
Unvested options, weighted average exercise price | $ / shares $ 14.51
Weighted average remaining contractual term, options outstanding 3 years 6 months 21 days
Weighted average remaining contractual term, options exercisable 3 years 1 month 6 days
Weighted average remaining contractual term, options unvested 5 years 6 months 21 days
Aggregate intrinsic value, options outstanding | $ $ 0.0
Aggregate intrinsic value, options exercisable | $ 0.0
Aggregate intrinsic value, options unvested | $ $ 0.0