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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2012
Valuation and Qualifying Accounts | 3. Valuation and Qualifying Accounts
|  | Balance at Beginning of Year |  |  | Charged to Expense |  |  | Deductions(1) |  |  | Balance at End of Year |
Allowance for doubtful accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2012 |  | $ | 11,706 |  |  |  | 18,012 |  |  |  | (21,061 | ) |  | $ | 8,657 |
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 |
(1) | Deductions represent accounts written off, net of recoveries.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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Period Type: | duration