Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES:
Net income (loss)	$ (218,088)	$ 37,138
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, and amortization	198,632	178,976
Impairments (Note 2)	234,880	0
Amortization of debt issuance costs and debt discount (Note 7)	1,677	1,645
(Gain) loss on derivatives (Note 11)	(5,232)	25,608
Cash receipts (payments) on derivatives settled, net (Note 11)	11,829	(18,040)
Deferred tax expense (benefit)	(53,081)	12,380
(Gain) loss on disposition of assets	1,424	(575)
Stock compensation plans	17,027	17,397
Contract assets and liabilities, net (Note 3)	(1,930)	(3,671)
Other, net	2,332	2,835
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	38,821	(10,611)
Accounts payable	(31,606)	(14,867)
Material and supplies	(51)	0
Accrued liabilities	17,086	16,242
Other, net	5,730	(2,975)
Net cash provided by operating activities	219,450	241,482
INVESTING ACTIVITIES:
Capital expenditures	(364,954)	(304,054)
Producing properties and other acquisitions	(3,345)	(769)
Proceeds from disposition of assets	10,506	25,316
Net cash used in investing activities	(357,793)	(279,507)
FINANCING ACTIVITIES:
Borrowings under credit agreement	392,200	71,200
Payments under credit agreement	(254,000)	(249,200)
Payments on finance leases	(2,984)	(2,869)
Proceeds from investments of non-controlling interests	0	300,000
Employee taxes paid by withholding shares	(4,080)	(4,947)
Transaction costs associated with non-controlling interests	0	(2,303)
Distributions to non-controlling interest	(918)	0
Bank overdrafts	2,285	17,000
Net cash provided by financing activities	132,503	128,881
Net increase (decrease) in cash and cash equivalents	(5,840)	90,856
Cash and cash equivalents, beginning of period	6,452	701
Cash and cash equivalents, end of period	612	91,557
Cash paid during the year for:
Interest paid (net of capitalized)	13,686	14,418
Income taxes	0	3,600
Changes in accounts payable and accrued liabilities related to purchases of property, plant, and equipment	40,210	(28,770)
Non-cash (addition) reduction to oil and natural gas properties related to asset retirement obligations	$ 1,906	$ 8,546