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Accounts Receivable and Major Customers (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Summary of Accounts Receivable
The following table summarizes our accounts receivable by type as of the dates presented:
 
December 31,
 
2017
 
 
2016
Customers
$
39,106

 
 
$
20,489

Joint interest partners
32,493

 
 
7,238

Other
584

 
 
3,789

 
72,183

 
 
31,516

Less: Allowance for doubtful accounts
(2,362
)
 
 
(2,421
)
 
$
69,821

 
 
$
29,095