Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income (loss)	$ 40,021	$ (311,395)
Adjustments to reconcile income (loss) to net cash provided by operating activities
Depreciation, depletion and amortization	54,382	59,577
Impairment of proved oil and gas properties	0	274,413
(Gain) loss on derivatives, net	(25,316)	(10,553)
Cash received for derivative settlements, net	1,519	51,163
Stock-based compensation expense, net	2,014	11,522
Non-cash interest expense, net	1,091	1,160
Other, net	1,620	1,116
Changes in components of working capital and other assets and liabilities-
Accounts receivable	(2,749)	(2,065)
Accounts payable	6,661	(18,711)
Accrued liabilities	(2,154)	(1,667)
Other assets and liabilities, net	(681)	(692)
Net cash provided by operating activities	76,408	53,868
Cash Flows From Investing Activities
Capital expenditures - oil and gas properties	(123,749)	(125,989)
Acquisitions of oil and gas properties	(7,032)	0
Proceeds from sales of oil and gas properties, net	17,372	1,785
Other, net	(417)	(617)
Net cash used in investing activities	(113,826)	(124,821)
Cash Flows From Financing Activities
Borrowings under credit agreement	280,504	73,647
Repayments of borrowings under credit agreement	(244,504)	(43,097)
Payments of debt issuance costs	(50)	(50)
Other, net	(335)	(307)
Net cash provided by financing activities	35,615	30,193
Net Decrease in Cash and Cash Equivalents	(1,803)	(40,760)
Cash and Cash Equivalents, Beginning of Period	4,194	42,918
Cash and Cash Equivalents, End of Period	$ 2,391	$ 2,158