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Stock Compensation (Details) - $ / shares
1 Months Ended
Apr. 30, 2019
Nov. 30, 2018
Oct. 01, 2018
May 01, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share price (usd per share)     $ 10.51  
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 (shares)       5,085,649
Increase of shares authorized for grant (shares)   400,000    
Long-Term Incentive Plan 2010 | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in dollars per share)   $ 9.18    
Employee | Long-Term Incentive Plan 2010 | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted in period (shares)   1,008,998    
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 (shares)   59,812    
Subsequent Event | 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 (shares) 51,504