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Common Stock and Stock Compensation - Additional Disclosures (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2015
Feb. 28, 2015
Sep. 30, 2015
Sep. 30, 2015
May. 01, 2010
2010 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Additional shares authorized 1,081,200 643,673      
Common Stock Class A Non-voting [Member] | 2010 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized         1,575,750
Restricted Stock and Phantom Share-Based Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unamortized fair value of awards     $ 11.6 $ 11.6  
Weighted average period over which costs amortized       4 years  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       3 years  
Restricted Stock [Member] | Non-employee directors [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       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%  
Phantom Share-Based Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Market-conditioned awards, period of performance achievement       6 years  
Phantom Share-Based Awards [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Market-conditioned awards, target per-share trading price (in dollars per share)       $ 15  
Service period       1 year 1 month  
Phantom Share-Based Awards [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Market-conditioned awards, target per-share trading price (in dollars per share)       $ 80  
Service period       4 years  
Phantom Share-Based Awards [Member] | Accounts Payable and Other Accrued Expenses [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards classified as current liabilities, value     $ 3.9 $ 3.9  
Performance based awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expense recorded to true-up awards     $ 1.5