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Common Stock (Details) (USD $) | 0 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2012 | Aug. 31, 2012 | Jul. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Aug. 31, 2012 Class A [Member] | Jul. 31, 2012 Class A [Member] | Aug. 31, 2012 Class B [Member] | Jul. 31, 2012 Class B [Member] | Sep. 30, 2012 Class B [Member] | Nov. 30, 2006 Class B [Member] | Aug. 31, 2012 Common Class A and Class B [Member]
Common stock (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable per share | $ 0.035 |  |  |  |  | $ 0.035 | $ 0.02 | $ 0.035 | $ 0.02 |  |  |
Shares repurchased, value |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  |
Company incremental dividends |  |  |  |  |  | $ 0.015 |  | $ 0.015 |  |  |  |
Incremental dividends paid |  |  |  |  |  |  |  |  |  |  |  | 565,000
Number of additional shares authorized to be repurchased |  |  |  |  |  |  |  |  |  |  | 13,000,000 |
Shares repurchased, average stock price per share |  |  |  |  |  |  |  |  |  | $ 4.29 |  |
Number of shares repurchased |  |  |  |  |  |  |  |  |  | 365,000 |  |
Common Stock (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividend payments |  |  | 753,000 | 2,806,000 | 2,193,000 |  |  |  |  |  |  |
Increase in dividend payable rate |  | $ 0.14 |  |  |  |  |  |  |  |  |  |
Increase in dividend payable amount |  | 5,300,000 |  |  |  |  |  |  |  |  |  |
Treasury stock shares retired |  |  |  | 1,000,000 |  |  |  |  |  |  |  |
Excess of purchase price over par value |  |  |  | $ 2,600,000 |  |  |  |  |  |  |  |

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