Summarized Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Quarterly Financial Information Table Text Block

	2016
	1st Quarter			2nd Quarter			3rd Quarter			4th Quarter			Total
Operating revenues	$	159,386		$	146,591		$	199,253		$	215,861		$	721,091
Operating expenses		126,868			94,746			99,788			99,313			420,715
Other income (expense), net:
Interest expense (excludes contractual interest    expense of $141.5 million for the year ended    December 31, 2016)		(49,903	)		(16,662	)		—			—			(66,565	)
Restructuring expenses		(5,579	)		(1,569	)		(28	)		—			(7,176	)
Contract settlement		—			—			—			(131,106	)		(131,106	)
Other income (expense), net		943			2,411			2,124			1,993			7,471
Total other (expense) income, net		(54,539	)		(15,820	)		2,096			(129,113	)		(197,376	)
Reorganization items, net		—			(22,183	)		(3,109	)		(22,211	)		(47,503	)
Income before income tax (benefit) provision		(22,021	)		13,842			98,452			(34,776	)		55,497
Income tax (benefit) provision		(190	)		(160	)		45			(349	)		(654	)
Net (loss) income	$	(21,831	)	$	14,002		$	98,407		$	(34,427	)	$	56,151
Net income (loss) per common share — basic	$	(0.14	)	$	0.09		$	0.64		$	(0.22	)	$	0.37
Net income (loss) per common share — fully diluted	$	(0.14	)	$	0.09		$	0.64		$	(0.22	)	$	0.36

	2015
	1st Quarter			2nd Quarter			3rd Quarter			4th Quarter			Total
Operating revenues	$	219,309		$	207,998		$	222,503		$	189,301		$	839,111
Gain (loss) on commodity derivatives		36,865			(3,646	)		9,390			2			42,611
Operating expenses		189,347			188,483			195,339			207,452			780,621
Ceiling test and other impairments		—			—			—			3,144,899			3,144,899
Interest expense		(42,668	)		(42,619	)		(43,137	)		(43,494	)		(171,918	)
Other income (expense), net		(992	)		1,827			2,354			903			4,092
Income before income tax provision		23,167			(24,923	)		(4,229	)		(3,205,639	)		(3,211,624	)
Income tax provision		(2,022	)		(250	)		(1,133	)		(999	)		(4,404	)
Net income	$	25,189		$	(24,673	)	$	(3,096	)	$	(3,204,640	)	$	(3,207,220	)
Net income per common share — basic	$	0.16		$	(0.16	)	$	(0.02	)	$	(20.91	)	$	(20.94	)
Net income per common share — fully diluted	$	0.16		$	(0.16	)	$	(0.02	)	$	(20.91	)	$	(20.94	)