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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 19, 2017
May 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
May 17, 2019
Share Based Compensation              
Options outstanding and exercisable (in share)     324,014   324,014    
Weighted average exercise price of options exercisable (in dollars per share)     $ 12.77   $ 12.77    
Average remaining contractual term of options exercisable         5 years 1 month 6 days    
Stock-based compensation expense     $ 3.2 $ 9.0 $ 6.4 $ 12.5  
Special Equity Plan              
Share Based Compensation              
Shares of common stock authorized for issuance under the share-based compensation plan 1,500,000            
2019 Omnibus Incentive Plan              
Share Based Compensation              
Shares of common stock authorized for issuance under the share-based compensation plan             2,025,000
2016 Omnibus Incentive Plan              
Share Based Compensation              
Available for issuance (in shares)             243,611
Stock Options | Special Equity Plan              
Share Based Compensation              
Issued (in shares) 800,000            
Performance-based stock awards              
Share Based Compensation              
Shares outstanding     342,017   342,017    
Weighted average grant date fair value     $ 21.61   $ 21.61    
Performance-based stock awards | Special Equity Plan              
Share Based Compensation              
Issued (in shares) 300,000            
Performance period   33 months          
Reduction in performance period   3 months          
Incremental fair value           $ 5.9  
Unvested restricted stock              
Share Based Compensation              
Shares outstanding     1,423,551   1,423,551    
Employee Service Based Awards              
Share Based Compensation              
Shares outstanding     1,026,979   1,026,979    
Weighted average grant date fair value     $ 21.30   $ 21.30    
Director Service Based Awards              
Share Based Compensation              
Shares outstanding     54,555   54,555    
Weighted average grant date fair value     $ 24.67   $ 24.67