CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net income (loss)	$ 116,604,000	$ (30,598,000)
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Deferred income tax expense	45,787,000	14,158,000
Depletion, depreciation and amortization and impairment	280,223,000	345,906,000
Exploration dry hole costs	0	2,000
Abandonment and impairment of unproved properties	25,429,000	66,695,000
Derivative fair value (income) loss	(133,514,000)	117,299,000
Cash settlements on derivative financial instruments	58,341,000	(5,350,000)
Allowance for doubtful accounts	0	(1,500,000)
Amortization of deferred financing costs and other	3,243,000	2,376,000
Deferred and stock-based compensation	13,727,000	34,167,000
Gain on the sale of assets	(5,678,000)	(179,000)
Changes in working capital:
Accounts receivable	201,428,000	(14,425,000)
Inventory and other	(5,035,000)	796,000
Accounts payable	(29,132,000)	14,615,000
Accrued liabilities and other	(125,907,000)	1,553,000
Net cash provided from operating activities	445,516,000	545,515,000
Investing activities:
Additions to natural gas and oil properties	(380,718,000)	(584,432,000)
Additions to field service assets	(697,000)	(1,863,000)
Acreage purchases	(31,920,000)	(37,900,000)
Proceeds from disposal of assets	34,366,000	366,000
Purchases of marketable securities held by the deferred compensation plan	(15,170,000)	(27,271,000)
Proceeds from the sales of marketable securities held by the deferred compensation plan	18,226,000	25,459,000
Net cash used in investing activities	(375,913,000)	(625,641,000)
Financing activities:
Borrowings on credit facilities	1,151,000,000	1,114,000,000
Repayments on credit facilities	(1,199,000,000)	(1,011,000,000)
Dividends paid	(10,049,000)	(9,960,000)
Taxes paid for shares withheld	(3,343,000)	(3,021,000)
Debt issuance costs	0	(8,257,000)
Change in cash overdrafts	(8,762,000)	(7,318,000)
Proceeds from the sales of common stock held by the deferred compensation plan	513,000	5,649,000
Net cash (used in) provided from financing activities	(69,641,000)	80,093,000
Decrease in cash and cash equivalents	(38,000)	(33,000)
Cash and cash equivalents at beginning of period	545,000	448,000
Cash and cash equivalents at end of period	$ 507,000	$ 415,000