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Revenue Recognition Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2018 and 2017 (in thousands):

 
 
Three Months Ended March 31, 2018
Three Months Ended March 31, 2017
Oil, natural gas and NGLs sales:
 
 
 
Oil
 
$
11,439

$
7,201

Natural gas
 
35,767

31,063

NGLs
 
5,560

4,148

Other
 
(14
)
—

Total
 
$
52,752

$
42,412