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Accounts Receivable | 12 Months Ended
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Dec. 31, 2014
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable A summary of accounts receivable is as follows (in thousands):
| December 31,
| 2014 |  | 2013
Oil, natural gas and NGL sales | $ | 139,848 |  |  | $ | 166,157 |
Joint interest billing | 170,937 |  |  | 168,596 |
Oil and natural gas services | 21,436 |  |  | 17,904 |
Insurance receivable | — |  |  | 2,500 |
Other | 4,939 |  |  | 5,122 |
| 337,160 |  |  | 360,279 |
Less: allowance for doubtful accounts | (7,083 | ) |  | (11,061 | )
Total accounts receivable, net | $ | 330,077 |  |  | $ | 349,218 |
The following table presents the balance and activity in the allowance for doubtful accounts for the years ended December 31, 2014, 2013 and 2012 (in thousands):
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
Allowance for doubtful accounts at January 1 | $ | 11,061 |  |  | $ | 5,635 |  |  | $ | 3,906 |
Additions charged to costs and expenses(1) | 818 |  |  | 5,497 |  |  | 1,735 |
Deductions(2) | (4,796 | ) |  | (71 | ) |  | (6 | )
Allowance for doubtful accounts at December 31 | $ | 7,083 |  |  | $ | 11,061 |  |  | $ | 5,635 |
____________________
(1) | Includes $2.7 million of allowance for receivables deemed uncollectible at December 31, 2013 primarily due to bankruptcy status of customers.
(2) | Deductions represent write-off of receivables and collections of amounts for which an allowance had previously been established. Year ended December 31, 2014 represents write-off of allowance related to the sale of the Gulf Properties.

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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 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 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=35738203&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 3 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 Reference 6: 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=26873400&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Article 4 Reference 8: 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=35738203&loc=d3e5162-111524 + Details
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