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Common Stock and Stock Compensation - Other Disclosures (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Mar. 25, 2014 | Mar. 24, 2014
Restricted Stock [Member] | Executive Chairman [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Accelerated vesting of restricted stock |  |  | 270,000 |  |  |  |
Gross compensation costs |  |  | $ 2.2 |  |  |  |
Restricted Stock [Member] | Executive Chairman [Member] | October 2, 2014 [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Accelerated vesting of restricted stock |  |  | 135,000 |  |  |  |
Restricted Stock [Member] | Executive Chairman [Member] | October 2, 2016 [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Accelerated vesting of restricted stock |  |  | 135,000 |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock, shares authorized |  |  |  | 100,000,000 | 100,000,000 | 100,000,000 | 55,550,000
Treasury stock acquired, shares |  | 1,000,000 |  |  |  |  |
Treasury stock acquired, value |  | $ 11.9 |  |  |  |  |
Treasury stock retired, shares | 1,000,000 |  |  |  |  |  |

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