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Common Stock, Options, and Stock Compensation (Details Textuals 2) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2014 | Sep. 30, 2014 | Mar. 25, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired |  |  |  | $ 11,900,000 | $ 11,903,000 |  |  |  |  |  |  |
Treasury stock retired |  |  |  |  | 0 |  |  |  |  |  |  |
Treasury stock value |  | $ 11,901,000 |  | $ 11,901,000 | $ 0 |  |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares authorized |  | 100,000,000 | 100,000,000 | 100,000,000 | 100,000,000 | 100,000,000 | 56,000,000 | 55,550,000 | 54,000,000 | 54,000,000 | 56,000,000 | 56,000,000
Treasury stock acquired, shares |  | 1,000,000 |  |  |  |  |  |  |  |  |  |
Treasury stock acquired |  | $ 11,900,000 |  |  |  |  |  |  |  |  |  |
Treasury stock retired | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Executive Chairman [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting of restricted stock |  |  | 270,000 |  |  |  |  |  |  |  |  |
Gross compensation costs |  |  | $ 2,200,000 |  |  |  |  |  |  |  |  |
October 2, 2014 [Member] | Executive Chairman [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting of restricted stock |  |  | 135,000 |  |  |  |  |  |  |  |  |
October 2, 2016 [Member] | Executive Chairman [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting of restricted stock |  |  | 135,000 |  |  |  |  |  |  |  |  |

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