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Share-Based Compensation (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchase program, period (in years) 3 years      
Common stock repurchased and retired     $ 963,000  
Long-Term Incentive Plan 2010 | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment award, options, grants in period, weighted average grant date fair value (usd per share)   $ 5.03    
Long-Term Incentive Plan 2010 | Non-employee Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)   143,145    
Long-Term Incentive Plan 2010 | Non-employee Directors | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     222,912  
Share-based payment award, options, grants in period, weighted average grant date fair value (usd per share)     $ 6.46  
Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchase program, amount authorized $ 60,000,000.0   $ 60,000,000.0  
Common stock repurchased and retired (in shares)   0   943,149
Common stock repurchased and retired       $ 5,200,000