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Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Balance at Beginning of Year |  |  | Charged to Expense |  |  | Deductions(1) |  |  | Balance at End of Year |
Allowance for doubtful accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2011 |  | $ | 30,112 |  |  |  | 34,364 |  |  |  | (52,770 | ) |  | $ | 11,706 |
Year ended December 31, 2010 |  | $ | 7,553 |  |  |  | 38,511 |  |  |  | (15,952 | ) |  | $ | 30,112 |
Year ended December 31, 2009 |  | $ | 6,356 |  |  |  | 14,016 |  |  |  | (12,819 | ) |  | $ | 7,553 |
(1) | Deductions represent accounts written off, net of recoveries.

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