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Accounts Receivable and Major Customers (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Summary of Accounts Receivable
The following table summarizes our accounts receivable by type as of the dates presented:
 
December 31,
 
2018
 
2017
Customers
$
59,030

 
$
39,106

Joint interest partners
6,404

 
32,493

Other
640

 
584

 
66,074

 
72,183

Less: Allowance for doubtful accounts
(36
)
 
(2,362
)
 
$
66,038

 
$
69,821
Revenue from External Customers by Products and Services [Table Text Block]
The following table illustrates the impact of the adoption of ASC Topic 606 on our Condensed Consolidated Statement of Operations for the year ended December 31, 2018:
 
Year Ended December 31, 2018
 
As Determined Under
 
As Reported Under
 
 
 
Prior GAAP
 
ASC Topic 606
 
Net Change
Revenues
 
 
 
 
 
Crude oil
$
402,485

 
$
402,485

 
$
—

Natural gas liquids
$
23,429

 
$
21,073

 
$
(2,356
)
Natural gas
$
15,972

 
$
15,972

 
$
—

Marketing services (included in Other revenues, net)
$
523

 
$
523

 
$
—

Operating expenses
 
 
 
 
 
Gathering, processing and transportation
$
20,982

 
$
18,626

 
$
(2,356
)
Net income
$
224,785

 
$
224,785

 
$
—