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Share-Based Compensation Schedule of Stock Option Transactions (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Stock options outstanding, beginning of year 2,098,933  
Options exercised 0  
Options Cancelled (296,546)  
Stock options outstanding, end of year 1,802,387 2,098,933
Options exercisable, shares 1,780,124  
Unvested options, shares 22,263  
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]    
Weighted average exercise price, beginning of year $ 22.27  
Weighted average exercise price, granted in period 0  
Weighted average exercise price, cancelled in period 30.81  
Weighted average exercise price, end of year 20.87 $ 22.27
Options exercisable, weighted average exercise price 20.93  
Unvested options, weighted average exercise price $ 15.68  
Weighted average remaining contractual term, options outstanding 2 years 3 months 21 days  
Weighted average remaining contractual term, options exercisable 2 years 3 months 18 days  
Weighted average remaining contractual term, options unvested 4 years 2 months 12 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, Additional General Disclosures [Abstract]    
Intrinsic value of options exercised   $ 0.1