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Accounts Receivable | 12 Months Ended
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Dec. 31, 2018
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable A summary of accounts receivable is as follows (in thousands):
| December 31, |  |
| 2018 |  | 2017
Oil, natural gas and NGL sales | $ | 31,780 |  | $ | 35,301
Joint interest billing | 13,083 |  | 29,505
Oil and natural gas services | 604 |  | 639
Other | 1,331 |  | 7,106
Total accounts receivable | 46,798 |  | 72,551
Less: allowance for doubtful accounts | (1,295) |  | (1,274)
Total accounts receivable, net | $ | 45,503 |  | $ | 71,277
The following table presents the balance and activity in the allowance for doubtful accounts for the years ended December 31, 2018 and 2017, the Successor 2016 Period and the Predecessor 2016 Period (in thousands):
| Successor |  |  |  |  |  |  | Predecessor
| Year Ended December 31, 2018 |  | Year Ended December 31, 2017 |  | Period from October 2, 2016 through December 31, 2016 |  |  | Period from January 1, 2016 through October 1, 2016
Beginning balance | $ | 1,274 |  | $ | 880 |  | $ | — |  |  | $ | 4,847
Additions charged to costs and expenses(1) | 758 |  | 397 |  | 880 |  |  | 16,695
Deductions(2) | (737) |  | (3) |  | — |  |  | (751)
Impact of fresh start accounting | — |  | — |  | — |  |  | (20,791)
Ending balance | $ | 1,295 |  | $ | 1,274 |  | $ | 880 |  |  | $ | —
____________________ 1.The Predecessor 2016 Period includes a $16.7 million addition for a joint interest account receivable after determining that future collection was doubtful when the joint interest owner filed for bankruptcy. 2.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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
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