Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING ACTIVITIES:
Net loss	$ (803,674)	$ (2,282)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion, and amortization	61,617	62,126
Impairments (Note 3)	741,924	0
Loss on abandonment of assets (Note 3)	17,554	0
Amortization of debt issuance costs and debt discount (Note 8)	567	556
(Gain) loss on derivatives (Note 12)	(483)	6,932
Cash receipts on derivatives settled (Note 12)	551	2,656
Loss on disposition of assets	390	1,615
Deferred tax benefit	(2,508)	(444)
Employee stock compensation plans	2,568	5,134
ARO liability accretion (Note 9)	596	562
Contract assets and liabilities, net (Note 4)	808	(700)
Other, net	(740)	11
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	28,277	22,940
Material and supplies	35	(22)
Prepaid expenses and other	420	747
Accounts payable	(12,341)	(20,848)
Accrued liabilities	(4,840)	2,749
Income taxes	(917)	0
Contract advances	108	(544)
Net cash provided by operating activities	29,912	81,188
INVESTING ACTIVITIES:
Capital expenditures	(17,528)	(122,507)
Producing properties and other acquisitions	(210)	(1,580)
Proceeds from disposition of property and equipment	1,751	3,190
Net cash used in investing activities	(15,987)	(120,897)
FINANCING ACTIVITIES:
Borrowings under line of credit	71,400	109,800
Payments under line of credit	(35,100)	(69,800)
Net payments on finance leases	(1,026)	(985)
Employee taxes paid by withholding shares	(43)	(4,110)
Distributions to non-controlling interest	0	(918)
Bank overdrafts	(8,733)	3,161
Net cash provided by financing activities	26,498	37,148
Net increase (decrease) in cash and cash equivalents	40,423	(2,561)
Cash and cash equivalents, beginning of period	571	6,452
Cash and cash equivalents, end of period	40,994	3,891
Cash paid during the year for:
Interest paid (net of capitalized)	2,141	(3,307)
Income taxes	0	0
Changes in accounts payable and accrued liabilities related to purchases of property, plant, and equipment	4,812	(641)
Non-cash (additions) reductions to oil and natural gas properties related to asset retirement obligations	3,404	(3,070)
Non-cash trade of property, plant, and equipment	$ 548	$ 0