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Share-Based Compensation Schedule Of Stock Option Transactions (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2020
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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at beginning of period 1,802,387
Options canceled (305,163)
Outstanding at end of period 1,497,224
Options exercisable, shares 1,494,157
Unvested options, shares 3,067
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average exercise price, beginning of year $ 20.87
Weighted average exercise price, canceled in period 30.12
Weighted average exercise price, end of year 18.98
Options exercisable, weighted average exercise price 19.00
Unvested options, weighted average exercise price $ 7.52
Weighted average remaining contractual term, options outstanding 2 years 3 months 3 days
Weighted average remaining contractual term, options exercisable 2 years 3 months 3 days
Weighted average remaining contractual term, options unvested 4 years 2 months 4 days
Aggregate intrinsic value, options outstanding $ 0.0
Aggregate intrinsic value, options exercisable 0.0
Aggregate intrinsic value, options unvested 0.0
Income tax effect of compensation plan $ 1.0