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Accounts Receivable | 12 Months Ended
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Dec. 31, 2015
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable A summary of accounts receivable is as follows (in thousands):
| December 31,
| 2015 |  | 2014
Oil, natural gas and NGL sales | $ | 61,140 |  |  | $ | 139,848 |
Joint interest billing | 60,403 |  |  | 170,937 |
Oil and natural gas services | 2,417 |  |  | 21,436 |
Other | 8,274 |  |  | 4,939 |
| 132,234 |  |  | 337,160 |
Less: allowance for doubtful accounts | (4,847 | ) |  | (7,083 | )
Total accounts receivable, net | $ | 127,387 |  |  | $ | 330,077 |
The following table presents the balance and activity in the allowance for doubtful accounts for the years ended December 31, 2015, 2014 and 2013 (in thousands):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Beginning balance | $ | 7,083 |  |  | $ | 11,061 |  |  | $ | 5,635 |
Additions charged to costs and expenses(1) | 1,320 |  |  | 818 |  |  | 5,497 |
Deductions(2) | (3,556 | ) |  | (4,796 | ) |  | (71 | )
Ending balance | $ | 4,847 |  |  | $ | 7,083 |  |  | $ | 11,061 |
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(1) | Includes $2.7 million of allowance for receivables deemed uncollectible at December 31, 2013, primarily due to the bankruptcy status of customers.
(2) | Deductions represent write-off of receivables and collections of amounts for which an allowance had previously been established. Deductions in 2015 are primarily due to the write-off of receivables in conjunction with a lawsuit settlement, and deductions in 2014 are 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 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 Reference 2: 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 3: 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=49124121&loc=d3e5162-111524 Reference 4: 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 5: 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=49124121&loc=d3e5074-111524 Reference 6: 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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