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

6 Months Ended

Jun. 30, 2017

Non-Operated Eagle Ford Divestiture 2017 [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Disposal Groups, Including Discontinued Operations [Table Text Block]

The following table presents income (loss) before income taxes from the outside-operated Eagle Ford shale assets sold for the three and six months ended June 30, 2017, and 2016. This divestiture is considered a disposal of a significant asset group.

	For the Three Months Ended   June 30,				For the Six Months Ended   June 30,
	2017		2016		2017		2016
	(in thousands)
Income (loss) before income taxes (1)	$	—	$	12,832	$	24,324	$	(273,567	)

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⁽¹⁾  Income (loss) before income taxes reflects oil, gas, and NGL production revenue, less oil, gas, and NGL production expense, and depletion, depreciation, amortization, and asset retirement obligation liability accretion. Additionally, income (loss) before income taxes included impairment of proved properties expense of approximately $269.6 million for the six months ended June 30, 2016.