Supplemental Condensed Consolidated Financial Information (Condensed Consolidating Statements of Cash Flows (Unaudited)) (Details) - USD ($) $ in Thousands	1 Months Ended	8 Months Ended	9 Months Ended
	Sep. 30, 2020	Aug. 31, 2020	Sep. 30, 2019
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$ 9,674	$ 44,956	$ 219,450
INVESTING ACTIVITIES:
Capital expenditures	(1,598)	(25,775)	(364,954)
Producing properties and other acquisitions	0	(382)	(3,345)
Proceeds from disposition of property and equipment	576	6,018	10,506
Net cash provided by (used in) investing activities	(1,022)	(20,139)	(357,793)
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility	0	87,400	392,200
Payments under line of credit	(4,000)	(64,100)	(254,000)
DIP financing costs	0	(3,225)	0
Intercompany borrowings (advances), net		0	0
DIP financing costs	0	990	0
Net payments on finance leases	(350)	(2,757)	(2,984)
Employee taxes paid by withholding shares	0	(43)	(4,080)
Distributions to non-controlling interest	0	0	(918)
Bank overdrafts	0	(8,733)	2,285
Net cash provided by (used in) financing activities	(4,350)	7,552	132,503
Net increase (decrease) in cash and cash equivalents	4,302	32,369	(5,840)
Cash, restricted cash, and cash equivalents, beginning of year	32,940	571	6,452
Cash, restricted cash, and cash equivalents, end of year	29,784	32,940	612
Consolidating Adjustments [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities		136,858	(34)
INVESTING ACTIVITIES:
Capital expenditures		0	0
Producing properties and other acquisitions		0	0
Proceeds from disposition of property and equipment		0	0
Net cash provided by (used in) investing activities		0	0
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility		0	0
Payments under line of credit		0	0
DIP financing costs		0
Intercompany borrowings (advances), net		(136,858)	34
DIP financing costs		0
Net payments on finance leases		0	0
Employee taxes paid by withholding shares		0	0
Distributions to non-controlling interest			0
Bank overdrafts		0	0
Net cash provided by (used in) financing activities		(136,858)	34
Net increase (decrease) in cash and cash equivalents		0	0
Cash, restricted cash, and cash equivalents, beginning of year	0	0	0
Cash, restricted cash, and cash equivalents, end of year		0	0
Parent [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities		(207,593)	11,054
INVESTING ACTIVITIES:
Capital expenditures		(986)	168
Producing properties and other acquisitions		0	0
Proceeds from disposition of property and equipment		1,169	11
Net cash provided by (used in) investing activities		183	179
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility		55,300	332,300
Payments under line of credit		(31,500)	(198,200)
DIP financing costs		(3,225)
Intercompany borrowings (advances), net		210,398	(143,692)
DIP financing costs		990
Net payments on finance leases		0	0
Employee taxes paid by withholding shares		(43)	(4,080)
Distributions to non-controlling interest			919
Bank overdrafts		(7,269)	1,622
Net cash provided by (used in) financing activities		222,671	(11,131)
Net increase (decrease) in cash and cash equivalents		15,261	102
Cash, restricted cash, and cash equivalents, beginning of year	15,764	503	403
Cash, restricted cash, and cash equivalents, end of year		15,764	505
Combined Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities		82,769	169,838
INVESTING ACTIVITIES:
Capital expenditures		(14,585)	(321,840)
Producing properties and other acquisitions		(382)	(3,345)
Proceeds from disposition of property and equipment		4,772	10,376
Net cash provided by (used in) investing activities		(10,195)	(314,809)
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility		0	0
Payments under line of credit		0	0
DIP financing costs		0
Intercompany borrowings (advances), net		(72,642)	144,867
DIP financing costs		0
Net payments on finance leases		0	0
Employee taxes paid by withholding shares		0	0
Distributions to non-controlling interest			0
Bank overdrafts		0	0
Net cash provided by (used in) financing activities		(72,642)	144,867
Net increase (decrease) in cash and cash equivalents		(68)	(104)
Cash, restricted cash, and cash equivalents, beginning of year	0	68	208
Cash, restricted cash, and cash equivalents, end of year		0	104
Combined Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities		32,922	38,592
INVESTING ACTIVITIES:
Capital expenditures		(10,204)	(43,282)
Producing properties and other acquisitions		0	0
Proceeds from disposition of property and equipment		77	119
Net cash provided by (used in) investing activities		(10,127)	(43,163)
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility		32,100	59,900
Payments under line of credit		(32,600)	(55,800)
DIP financing costs		0
Intercompany borrowings (advances), net		(898)	(1,209)
DIP financing costs		0
Net payments on finance leases		(2,757)	(2,984)
Employee taxes paid by withholding shares		0	0
Distributions to non-controlling interest			(1,837)
Bank overdrafts		(1,464)	663
Net cash provided by (used in) financing activities		(5,619)	(1,267)
Net increase (decrease) in cash and cash equivalents		17,176	(5,838)
Cash, restricted cash, and cash equivalents, beginning of year	$ 17,176	0	5,841
Cash, restricted cash, and cash equivalents, end of year		$ 17,176	$ 3