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Accounts Receivable and Major Customers (Tables)
 6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Summary of Accounts Receivable
The following table summarizes our accounts receivable by type as of the dates presented:
 
June 30,
 
 
December 31,
 
2017
 
 
2016
Customers
$
22,920

 
 
$
20,489

Joint interest partners
21,598

 
 
7,238

Other 1
670

 
 
3,789

 
45,188

 
 
31,516

Less: Allowance for doubtful accounts
(2,381
)
 
 
(2,421
)
 
$
42,807

 
 
$
29,095


_______________________
1 Includes amounts owed to us from joint venture partners for acquisitions in prior periods, severance tax refunds approved by state taxing authorities to be returned to us and other miscellaneous non-operating items.