Supplementary Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Supplementary Quarterly Financial Data (Unaudited)

	2016
	First			Second			Third			Fourth			Total
	(In thousands, except per share data)
Total oil and gas sales	$	36,163		$	40,715		$	50,330		$	48,498		$	175,706
Operating loss	$	(56,490	)	$	(22,706	)	$	(98,789	)	$	(5,805	)	$	(183,790	)
Net income (loss)	$	(56,577	)	$	4,852		$	(28,476	)	$	(54,933	)	$	(135,134	)
Income (loss) per share:
Basic and diluted	$	(5.71	)	$	0.42		$	(2.32	)	$	(4.48	)	$	(11.52	)

	2017
	First			Second			Third			Fourth			Total
	(In thousands, except per share data)
Total oil and gas sales	$	53,801		$	61,471		$	66,811		$	73,248		$	255,331
Operating income (loss)	$	2,381		$	10,470		$	11,190		$	(24,224	)	$	(183	)
Net loss	$	(22,931	)	$	(21,442	)	$	(24,736	)	$	(42,296	)	$	(111,405	)
Loss per share:
Basic and diluted	$	(1.61	)	$	(1.45	)	$	(1.67	)	$	(2.86	)	$	(7.61	)

Summary of Results of Operations from Non-Routine Items

Results of operations include the following non-routine items of income (expense), which are presented before the effect of income taxes:

	2016
	First			Second			Third			Fourth			Total
	(In thousands)
Gain (loss) on sale of oil and gas properties	$	740		$	(1,647	)	$	(13,196	)	$	(212	)	$	(14,315	)
Net gain (loss) on extinguishment of debt	$	33,380		$	56,196		$	100,540		$	(1,064	)	$	189,052
Impairments of unproved oil and gas properties	$	(7,753	)	$	—		$	(76,391	)	$	—		$	(84,144	)
Impairments of proved oil and gas properties	$	(22,718	)	$	(1,742	)	$	(113	)	$	(2,561	)	$	(27,134	)

	2017
	First			Second		Third			Fourth			Total
	(In thousands)
Gain (loss) on sale of oil and gas properties	$	(24	)	$	—	$	(1,036	)	$	—		$	(1,060	)
Impairments of proved oil and gas properties	$	—		$	—	$	—		$	(43,990	)	$	(43,990	)