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Share-Based Compensation Schedule Of Stock Option Transactions (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at beginning of period | shares 2,098,933
Options canceled | shares (283,029)
Outstanding at end of period | shares 1,815,904
Options exercisable, shares | shares 1,761,139
Unvested options, shares | shares 54,765
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average exercise price, beginning of year | $ / shares $ 22.27
Weighted average exercise price, canceled in period | $ / shares 30.90
Weighted average exercise price, end of year | $ / shares 20.93
Options exercisable, weighted average exercise price | $ / shares 21.08
Unvested options, weighted average exercise price | $ / shares $ 15.92
Weighted average remaining contractual term, options outstanding 2 years 9 months 18 days
Weighted average remaining contractual term, options exercisable 2 years 8 months 26 days
Weighted average remaining contractual term, options unvested 4 years 8 months 8 days
Aggregate intrinsic value, options outstanding | $ $ 0.0
Aggregate intrinsic value, options exercisable | $ 0.0
Aggregate intrinsic value, options unvested | $ $ 0.0
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years