CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (180,201,000)	$ (2,126,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	72,841,000	48,240,000
Amortization of debt issuance costs	2,681,000	2,517,000
Impairment of oil and gas properties	289,085,000	0
Stock-based compensation expense	7,501,000	3,918,000
Deferred income taxes	2,750,000	(877,000)
Increase in allowance for doubtful accounts	1,200,000	427,000
Other operating expenses	317,000	395,000
Derivative activities:
Total (gains) losses	(156,002,000)	45,297,000
Cash settlements on derivatives	71,499,000	11,578,000
Changes in assets and liabilities:
Decrease in accounts receivable	21,802,000	2,108,000
Increase in other assets	(3,642,000)	(8,001,000)
Decrease in accounts payable and accrued expenses	(32,102,000)	(8,319,000)
(Decrease) increase in other liabilities	(11,307,000)	336,000
Net cash provided by operating activities	86,422,000	95,493,000
Capital expenditures:
Development of oil and natural gas properties	(52,988,000)	(94,966,000)
Purchases of other property and equipment	(3,415,000)	(9,190,000)
Changes in capital investment accruals	(7,256,000)	(5,592,000)
Acquisition of properties and equipment and other	(2,076,000)	(2,689,000)
Proceeds from sale of property and equipment and other	217,000	38,000
Net cash used in investing activities	(65,518,000)	(112,399,000)
Cash flows from financing activities:
Borrowings under RBL credit facility	222,550,000	123,400,000
Repayments on RBL credit facility	(223,100,000)	(118,200,000)
Dividends paid on common stock	(19,420,000)	(19,662,000)
Purchase of treasury stock	0	(36,139,000)
Shares withheld for payment of taxes on equity awards and other	(934,000)	(946,000)
Net cash used in financing activities	(20,904,000)	(51,547,000)
Net increase (decrease) in cash and cash equivalents	0	(68,453,000)
Cash and cash equivalents:
Beginning	0	68,680,000
Ending	$ 0	$ 227,000