Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING ACTIVITIES:
Net income (loss)	$ 15,929	$ (41,149)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion, and amortization	46,932	55,590
Impairments (Note 2)	0	37,829
Amortization of debt issuance cost and debt discount	536	526
Gain on derivatives	(14,731)	(10,929)
Cash (payments) receipts on derivatives settled	(1,159)	7,140
Deferred tax expense (benefit)	13,936	(15,718)
Gain on disposition of assets	(824)	(469)
Employee stock compensation plans	3,704	4,798
Other, net	626	(1,269)
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	(1,900)	10,003
Accounts payable	(7,735)	11,013
Material and supplies	73	262
Accrued liabilities	9,832	10,702
Other, net	433	2,384
Net cash provided by operating activities	65,652	70,713
INVESTING ACTIVITIES:
Capital expenditures	(37,636)	(76,035)
Producing properties and other acquisitions	(7,508)	0
Proceeds from disposition of assets	16,116	38,380
Other	0	169
Net cash used in investing activities	(29,028)	(37,486)
FINANCING ACTIVITIES:
Borrowings under credit agreement	49,700	75,000
Payments under credit agreement	(60,500)	(95,800)
Payments on capitalized leases	(946)	(910)
Tax (benefit) expense from stock compensation	0	(376)
Book overdrafts	(17,301)	(11,237)
Net cash used in financing activities	(29,047)	(33,323)
Net increase (decrease) in cash and cash equivalents	7,577	(96)
Cash and cash equivalents, beginning of period	893	835
Cash and cash equivalents, end of period	8,470	739
Cash paid during the year for:
Interest paid (net of capitalized)	(2,389)	(2,024)
Income taxes	0	0
Changes in accounts payable and accrued liabilities related to purchases of property, plant, and equipment	(11,401)	19,685
Non-cash reductions to oil and natural gas properties related to asset retirement obligations	$ 912	$ 28,417