Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES:
Net loss	$ (137,307)	$ (728,024)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion, and amortization	160,023	279,739
Impairments (Notes 2 and 3)	161,563	1,149,367
(Gain) loss on derivatives	4,774	(12,917)
Cash receipts on derivatives settled	11,735	32,156
Deferred tax benefit	(73,159)	(437,220)
(Gain) loss on disposition of assets	(1,100)	6,270
Employee stock compensation plans	10,664	12,514
Other, net	(3,055)	1,834
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	759	84,098
Accounts payable	26,940	(4,432)
Material and supplies	231	(2,114)
Accrued liabilities	14,073	(363)
Income taxes	20,636	(4,975)
Other, net	985	5,549
Net cash provided by operating activities	197,762	381,482
INVESTING ACTIVITIES:
Capital expenditures	(154,558)	(484,028)
Proceeds from disposition of assets	46,880	9,838
Other	169	0
Net cash used in investing activities	(107,509)	(474,190)
FINANCING ACTIVITIES:
Borrowings under credit agreement	195,700	484,600
Payments under credit agreement	(261,700)	(388,900)
Payments on capitalized leases	(2,756)	(2,648)
Tax (benefit) expense from stock compensation	(376)	4
Book overdrafts	(21,043)	(503)
Net cash (used in) provided by financing activities	(90,175)	92,553
Net increase (decrease) in cash and cash equivalents	78	(155)
Cash and cash equivalents, beginning of period	835	1,049
Cash and cash equivalents, end of period	913	894
Cash paid during the year for:
Interest paid (net of capitalized)	16,650	12,691
Income taxes	0	3,277
Changes in accounts payable and accrued liabilities related to purchases of property, plant, and equipment	36,934	116,062
Non-cash reductions to oil and natural gas properties related to asset retirement obligations	$ 29,423	$ 8,558