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Accounts Receivable | 12 Months Ended
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Dec. 31, 2012
Accounts Receivable [Abstract] |
Accounts Receivable | 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 |
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 |
____________________
(1) | Deductions represent write-off of receivables and collections of amounts for which an allowance had previously been established.
During 2008, the Company established an allowance of $1.5 million for the outstanding balance from a customer in bankruptcy. During 2010, the Company received approximately $0.7 million from this customer and wrote off the remaining $0.8 million balance for a total reduction of the allowance of $1.5 million. During 2011, the Company established an allowance of $2.5 million for amounts subject to ongoing disputes and contract negotiations.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5162-111524 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 + Details
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