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Accounts Receivable | 12 Months Ended
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Dec. 31, 2019
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable A summary of accounts receivable is as follows (in thousands):
| December 31, |  |
| 2019 |  | 2018
Oil, natural gas and NGL sales | $ | 22,281 |  |  | $ | 31,780 |
Joint interest billing | 5,165 |  |  | 13,083 |
Other | 2,315 |  |  | 1,935 |
Total accounts receivable | 29,761 |  |  | 46,798 |
Less: allowance for doubtful accounts | (1,117) |  |  | (1,295) |
Total accounts receivable, net | $ | 28,644 |  |  | $ | 45,503 |
The following table presents the balance and activity in the allowance for doubtful accounts for the years ended December 31, 2019, 2018 and 2017 (in thousands):
| Year Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Beginning balance | $ | 1,295 |  |  | $ | 1,274 |  |  | $ | 880 |
Additions charged to costs and expenses | 6 |  |  | 758 |  |  | 397 |
Deductions(1) | (184) |  |  | (737) |  |  | (3) |
Ending balance | $ | 1,117 |  |  | $ | 1,295 |  |  | $ | 1,274 |
____________________ (1)Deductions represent the write-off of receivables and collections of amounts for which an allowance had previously been established.

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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