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Accounts Receivable
 12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Accounts Receivable Accounts Receivable
A summary of accounts receivable is as follows (in thousands):
 December 31,
 20212020
Oil, natural gas and NGL sales$18,829 $12,757 
Joint interest billing3,441 6,421 
Other1,262 4,754 
Total accounts receivable23,532 23,932 
Less: allowance for doubtful accounts(2,027)(4,356)
Total accounts receivable, net$21,505 $19,576 

The following table presents the balance and activity in the allowance for doubtful accounts for the years ended December 31, 2021 and 2020 (in thousands):
Year Ended December 31,
 20212020
Beginning balance$4,356 $1,117 
Additions charged to costs and expenses (1)21 3,239 
Deductions (2)(2,350)— 
Ending balance$2,027 $4,356 
____________________
(1)The Company performed an assessment of receivable balances related to governmental and other regulatory items during the year ended December 31, 2020, and recorded a $2.5 million allowance that is non-recurring in nature. The assessment was almost entirely reversed in the amount of $2.4 million during the second half of 2021.
(2)Deductions represent collections of amounts for which an allowance had previously been established.