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Revenue Recognition Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue Recognition [Abstract]  
Oil and gas sales, by product [Table Text Block]
The following table provides information regarding our oil and gas sales, by product, reported on the Statements of Operations for the three months ended June 30, 2018 and 2017 and the six months ended June 30, 2018 and 2017 (in thousands):

 
 
Three Months Ended June 30, 2018
 
Three Months Ended June 30, 2017
 
Six Months Ended June 30, 2018
 
Six Months Ended June 30, 2017
Oil, natural gas and NGLs sales:
 
 
 
 
 
 
 
 
Oil
 
$
9,638

 
$
6,527

 
$
21,078

 
$
13,728

Natural gas
 
36,369

 
35,043

 
72,136

 
66,106

NGLs
 
5,339

 
4,215

 
10,900

 
8,363

Other
 
—

 
(3
)
 
(14
)
 
(3
)
Total
 
$
51,347

 
$
45,782

 
$
104,099

 
$
88,194