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Stock Compensation - Additional Disclosures (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Feb. 28, 2015
Mar. 31, 2014
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Mar. 25, 2014
Mar. 24, 2014
May 01, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Allocated share-based compensation expense           $ 5,346 $ 2,374 $ 6,845      
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 $ 1,500                    
Common Stock Class A Non-Voting                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common Stock authorized (shares)           100,000,000 100,000,000   100,000,000 55,550,000  
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) 185,026                    
Restricted Stock and Phantom Share-Based Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Unamortized fair value of awards           $ 5,600          
Weighted average period over which costs amortized           2 years          
Restricted stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period           3 years          
Allocated share-based compensation expense           $ 5,346 $ (1,558) 6,845      
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                    
Options forfeited in period (shares) 720,000                    
Options forfeited in period, grant date fair value $ 3,400                    
Restricted stock | Non-employee directors                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period         2 years 2 years          
Percent of awards vesting on first anniversary of grant date         50.00% 50.00%          
Percent of awards vesting on second anniversary of grant date         50.00% 50.00%          
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                    
Options granted, weighted average grant date fair value (usd per share) $ 6.17                    
Restricted stock | Executive Chairman | 2010 Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Allocated share-based compensation expense       $ 2,200              
Vested in period (shares)       270,000              
Restricted stock | Employee | 2010 Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Options granted in period (shares) 961,718                    
Phantom stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Allocated share-based compensation expense           $ 0 3,932 $ 0      
Market-conditioned awards, period of performance achievement           6 years          
Phantom stock | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Market-conditioned awards, target per-share trading price (usd per share)           $ 15          
Service period           1 year 1 month          
Phantom stock | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Market-conditioned awards, target per-share trading price (usd per share)           $ 80          
Service period           4 years          
Phantom stock | Accounts Payable and Other Accrued Expenses                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Awards classified as current liabilities, value             3,900        
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 $ 800                    
Expense recorded to true-up awards             $ 1,500        
October 2, 2014 | Restricted stock | Executive Chairman | 2010 Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vested in period (shares)       135,000              
October 2, 2016 | Restricted stock | Executive Chairman | 2010 Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vested in period (shares)       135,000