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Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2012
Accounts Receivable [Abstract] |
Summary of Accounts Receivable | A summary of accounts receivable is as follows (in thousands):
| December 31,
| 2012 |  | 2011
Oil and natural gas sales | $ | 215,450 |  |  | $ | 134,491 |
Joint interest billing | 202,405 |  |  | 49,688 |
Oil and natural gas services | 21,186 |  |  | 18,798 |
Insurance receivable | 4,590 |  |  | — |
Production tax credits | 2,265 |  |  | 3,331 |
Related party | 978 |  |  | 1,645 |
Other | 4,267 |  |  | 2,289 |
| 451,141 |  |  | 210,242 |
Less: allowance for doubtful accounts | (5,635 | ) |  | (3,906 | )
Total accounts receivable, net | $ | 445,506 |  |  | $ | 206,336 |
Balance and Activity in Allowance for Doubtful Accounts | The following table presents the balance and activity in the allowance for doubtful accounts for the years ended December 31, 2012, 2011 and 2010 (in thousands):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Allowance for doubtful accounts at January 1 | $ | 3,906 |  |  | $ | 1,503 |  |  | $ | 3,590 |
Additions charged to costs and expenses | 1,735 |  |  | 2,511 |  |  | 129 |
Deductions(1) | (6 | ) |  | (108 | ) |  | (2,216 | )
Allowance for doubtful accounts at December 31 | $ | 5,635 |  |  | $ | 3,906 |  |  | $ | 1,503 |
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(1) | Deductions represent write-off of receivables and collections of amounts for which an allowance had previously been established.

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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