Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Summarized Results from Discontinued Operations

Summarized results from discontinued operations were as follows:

	For the Year
	2017			2016			2015
Revenues	$	15		$	5,862		$	43,845
Cost of oil and gas producing activities	(52		)	(6,578		)	(221,402		)
Other operating expenses	226			(7,754		)	(10,363		)
Income (loss) from discontinued operations before income taxes	$	189		$	(8,470	)	$	(187,920	)
Gain (loss) on sale of assets before income taxes	(197		)	(13,664		)	(706		)
Income tax benefit	46,039			5,269			2,496
Income (loss) from discontinued operations, net of taxes	$	46,031		$	(16,865	)	$	(186,130	)

Disposal Groups, Including Discontinued Operations

The major classes of assets and liabilities of discontinued operations at year-end 2017 and 2016 are as follows:

	At Year-End
	2017		2016
	(In thousands)
Assets of Discontinued Operations:
Receivables, net of allowance for bad debt	$	—	$	6
Prepaid expenses	—		8
	$	—	$	14
Liabilities of Discontinued Operations:
Accounts payable	$	—	$	67
Other accrued expenses	—		5,228
	$	—	$	5,295

Significant Operation and Investing Activities of DIscontinued Operations

Cash (used in) or provided by operating activities and investing activities of discontinued operations are as follows:

	For the Year
	2017			2016			2015
	(In thousands)
Operating activities:
Asset impairments	$	—		$	612		$	105,337
Changes in accounts payable and other accrued liabilities	(3,000		)	—			—
Dry hole and unproved leasehold impairment charges	—			—			67,639
Loss (gain) on sale of assets	197			13,664			706
Depreciation, depletion and amortization	—			2,202			28,391
	$	(2,803	)	$	16,478		$	202,073
Investing activities:
Oil and gas properties and equipment	$	—		$	(579	)	$	(49,717	)
Proceeds from sales of assets	200			77,105			17,800
	$	200		$	76,526		$	(31,917	)