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Incentive Compensation - Summary of Stock Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Weighted-Average Exercise Price, Outstanding at December 31, 2018 $ 17.07  
Weighted-Average Exercise Price, Cancelled or expired 17.50  
Weighted-Average Exercise Price, Outstanding at December 31, 2019 17.06  
Weighted-Average Exercise Price, Options vested and expected to vest at December 31, 2019 17.06  
Weighted-Average Exercise Price, Options exercisable at December 31, 2019 $ 17.06  
Weighted-Average Remaining Contractual Term (in years), Outstanding at December 31, 2019 4 years 8 months 12 days  
Weighted-Average Remaining Contractual Term (in years), Options vested and expected to vest at December 31, 2019 4 years 8 months 12 days  
Weighted-Average Remaining Contractual Term (in years), Options exercisable at December 31, 2019 4 years 8 months 12 days  
Employee Stock Option [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares, Outstanding at December 31, 2018 2,084,943  
Shares, Granted 0 0
Shares, Cancelled or expired (52,450)  
Shares, Outstanding at December 31, 2019 2,032,493  
Shares, Options vested and expected to vest at December 31, 2019 2,032,493  
Shares, Options exercisable at December 31, 2019 2,032,493