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Stock Compensation - Additional Disclosures (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Feb. 28, 2015
Dec. 31, 2016
Sep. 30, 2017
Oct. 01, 2016
May 01, 2010
2010 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Additional shares authorized (shares)     1,081,200 643,673        
Compensation not yet recognized   $ 1.5            
Common Stock Class A Non-Voting | 2010 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized (shares)               1,575,750
Increase (decrease) of shares authorized for grant (shares) 500,000 185,026            
Restricted Stock and Phantom Share-Based Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unamortized fair value of awards           $ 7.5    
Weighted average period over which costs amortized           2 years    
Restricted stock | 2010 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted, weighted average grant date fair value (usd per share)   $ 2.96     $ 9.60      
Share price (usd per share)             $ 11.06  
Options forfeited in period (shares)   720,000            
Options forfeited in period, grant date fair value   $ 3.4            
Restricted stock | Employee | 2010 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted in period (shares)   961,718     931,260      
Restricted stock | Non-employee directors                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           2 years    
Achievement performance target, probable percentage           80.00%    
Restricted stock | Non-employee directors | 2010 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted in period (shares)   130,000     72,500      
Options granted, weighted average grant date fair value (usd per share)   $ 6.17            
Performance based awards | 2010 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted in period (shares)   421,394            
Compensation not yet recognized   $ 0.8            
Vesting Tranche 1 | Restricted stock | Non-employee directors                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting rights percentage           50.00%    
Vesting Tranche 2 | Restricted stock | Non-employee directors                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting rights percentage           50.00%