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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Summary of Accounts Receivable
A summary of accounts receivable is as follows (in thousands):
 December 31,
 20182017
Oil, natural gas and NGL sales$31,780 $35,301 
Joint interest billing13,083 29,505 
Oil and natural gas services604 639 
Other1,331 7,106 
Total accounts receivable46,798 72,551 
Less: allowance for doubtful accounts(1,295)(1,274)
Total accounts receivable, net$45,503 $71,277 
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, 2018 and 2017, the Successor 2016 Period and the Predecessor 2016 Period (in thousands):
SuccessorPredecessor
 Year Ended December 31, 2018Year Ended December 31, 2017Period from October 2, 2016 through December 31, 2016Period 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 $— 
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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.