Divestitures, Assets Held for Sale, and Acquisitions (Tables)

9 Months Ended

Sep. 30, 2018

Divestitures, Assets Held for Sale, and Acquisitions [Abstract]

Disposal Groups, Including Discontinued Operations [Table Text Block]

The following table presents income (loss) before income taxes from the Divide County, North Dakota assets sold for the three and nine months ended September 30, 2018, and 2017. The Divide County Divestiture was considered a disposal of a significant asset group.

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2018		2017		2018			2017
	(in thousands)
Income (loss) before income taxes (1)	$	—	$	7,593	$	(28,975	)	$	(478,572	)

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⁽¹⁾  Income (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, impairment expense, and net loss on divestiture activity.