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Accounts Receivable and Revenues from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2019
Receivables [Abstract]  
Summary of Accounts Receivable
The following table summarizes our accounts receivable by type as of the dates presented:
 
June 30,
 
December 31,
 
2019
 
2018
Customers
$
48,347

 
$
59,030

Joint interest partners
3,546

 
6,404

Other
629

 
640

 
52,522

 
66,074

Less: Allowance for doubtful accounts
(51
)
 
(36
)
 
$
52,471

 
$
66,038