Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net Income (loss)	$ 258,848	$ 62,801
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, depletion and amortization	156,088	136,897
(Gain) loss on derivatives, net	62,835	97,310
Cash paid for commodity derivative settlements, net	(7,160)	(38,448)
Loss on extinguishment of debt	0	8,676
Stock-based compensation expense, net	7,969	10,724
Deferred income tax (benefit) expense	(177,521)	529
Non-cash interest expense, net	1,271	1,262
Other, net	2,079	3,975
Changes in components of working capital and other assets and liabilities-
Accounts receivable	(7,824)	2,437
Accounts payable	(6,544)	3,878
Accrued liabilities	12,733	(12,883)
Other assets and liabilities, net	(978)	(1,286)
Net cash provided by operating activities	301,796	275,872
Cash Flows From Investing Activities
Capital expenditures	(362,478)	(430,639)
Acquisition of oil and gas properties	8,222	0
Proceeds from divestitures of oil and gas properties, net	6,034	345,789
Other, net	(38)	(1,096)
Net cash used in investing activities	(348,260)	(85,946)
Cash Flows From Financing Activities
Redemptions of senior notes	0	(330,435)
Redemption of preferred stock	0	(50,030)
Borrowings under credit agreement	898,890	1,126,856
Repayments of borrowings under credit agreement	(801,993)	(933,156)
Payments of credit facility amendment fees	(613)	(627)
Payments of dividends on preferred stock	(8,812)	(9,337)
Cash paid for settlements of contingent consideration arrangements, net	(40,000)	0
Other, net	(1,008)	(638)
Net cash provided by (used in) financing activities	46,464	(197,367)
Net Decrease in Cash and Cash Equivalents	0	(7,441)
Cash and Cash Equivalents, Beginning of Period	2,282	9,540
Cash and Cash Equivalents, End of Period	$ 2,282	$ 2,099