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Stock Compensation (Details) - $ / shares
1 Months Ended 2 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Mar. 31, 2017
Sep. 30, 2016
Common Stock Class A Non-voting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (shares)       3,485,649
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) 500,000      
Long-Term Incentive Plan 2010 | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in dollars per share)   $ 9.60    
Employee | Long-Term Incentive Plan 2010 | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted in period (shares)   919,898    
Non-employee Directors | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     2 years  
Non-employee Directors | Restricted stock | Year One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options, vesting period     50.00%  
Non-employee Directors | Restricted stock | Year Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options, vesting period     50.00%  
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)   72,500