CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 28,268	$ 18,532
Accounts receivable:
Oil and gas sales	87,965	120,111
Joint interest operations	10,792	24,761
From affiliates	2,202	35,469
Derivative financial instruments	8,830	75,304
Income taxes receivable	0	5,109
Other current assets	11,773	10,399
Total current assets	149,830	289,685
Oil and natural gas properties, successful efforts method:
Proved	4,419,285	4,077,513
Unproved	384,763	410,897
Other	6,588	6,866
Accumulated depreciation, depletion and amortization	(798,288)	(486,473)
Net property and equipment	4,012,348	4,008,803
Goodwill	335,897	335,897
Income taxes receivable	0	5,109
Derivative financial instruments	1,185	13,888
Operating lease right-of-use assets	3,554	3,509
Other assets	40	231
Total assets	4,502,854	4,657,122
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	202,174	252,994
Accrued costs	112,695	137,166
Operating leases	2,318	1,994
Derivative financial instruments	63,595	222
Total current liabilities	380,782	392,376
Long-term debt	2,507,669	2,500,132
Deferred income taxes	163,550	211,772
Derivative financial instruments	66,373	4,220
Long-term operating leases	1,236	1,515
Reserve for future abandonment costs	19,402	18,151
Other non-current liabilities	1,162	6,351
Total liabilities	3,140,174	3,134,517
Commitments and contingencies
Stockholders' equity:
Common stock—$0.50 par, 400,000,000 shares authorized, 232,421,385 and 190,006,776 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	116,210	95,003
Additional paid-in capital	1,093,811	909,423
Accumulated earnings (deficit)	(22,341)	138,596
Total stockholders' equity	1,187,680	1,143,022
Total liabilities and stockholders' equity	4,502,854	4,657,122
Series A 10% Convertible Preferred Stock
Mezzanine equity:
Preferred Stock	0	204,583
Series B 10% Convertible Preferred Stock
Mezzanine equity:
Preferred Stock	$ 175,000	$ 175,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4531-111522