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Stock Compensation (Details) - $ / shares
1 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Oct. 01, 2017
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share price (usd per share)     $ 9.5  
Common Stock Class A Non-voting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (shares)       3,985,649
Long-Term Incentive Plan 2010 | Common Stock Class A Non-voting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Increase of shares authorized for grant (shares)   1,100,000    
Long-Term Incentive Plan 2010 | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in dollars per share) $ 9.75      
Employee | Long-Term Incentive Plan 2010 | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted in period (shares) 1,308,533      
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) 84,250      
Shares vesting on September 30, 2018 | Employee | Long-Term Incentive Plan 2010 | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted in period (shares) 190,725      
Shares vesting on September 30, 2020 | Employee | Long-Term Incentive Plan 2010 | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted in period (shares) 1,117,808