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Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2014
Receivables [Abstract] |
Summary of 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 |
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, 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 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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