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Divestitures, Assets Held for Sale, and Acquisitions (Tables)
 3 Months Ended
Mar. 31, 2018
Divestitures, Assets Held for Sale, and Acquisitions [Abstract]  
Disposal Groups, Including Discontinued Operations [Table Text Block]
The following table presents loss before income taxes for the three months ended March 31, 2018, and 2017, for the Company’s Divide County assets held for sale as of March 31, 2018, which are considered a significant asset group.
 
For the Three Months Ended March 31,
 
2018
 
2017
 
(in thousands)
Loss before income taxes (1)
$
(11,497
)
 
$
(332,719
)
____________________________________________
(1) 
Loss before income taxes reflects oil, gas, and NGL production revenue, less oil, gas, and NGL production expense, depletion, depreciation, amortization, and asset retirement obligation liability accretion expense, and impairment expense.