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Common Stock and Stock Compensation (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2019
USD ($)
Jun. 30, 2020
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
director
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock repurchase program, period (in years) 3 years          
Common stock repurchased and retired | $     $ 4,195,000 $ 963,000    
Share price (in dollars per share) | $ / shares   $ 6.46     $ 6.46  
Common Stock Class A Non-voting            
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) | shares   0     943,149  
Common stock repurchased and retired | $         $ 5,200,000  
Long-Term Incentive Plan 2010 | Common Stock Class A Non-voting            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares) | shares           5,485,649
Non-employee Directors | Long-Term Incentive Plan 2010            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of directors | director       9    
Non-employee Directors | Long-Term Incentive Plan 2010 | Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted in period (in shares) | shares       222,912