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Stock Compensation (Details) - $ / shares
1 Months Ended
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