Supplemental Condensed Consolidated Financial Information (Condensed Consolidating Statements of Cash Flows (Unaudited)) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$ 73,965	$ 26,467
INVESTING ACTIVITIES:
Capital expenditures	(7,673)	(23,804)
Producing properties and other acquisitions	0	(210)
Proceeds from disposition of property and equipment	15,278	4,497
Net cash provided by (used in) investing activities	7,605	(19,517)
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility	3,900	79,400
Payments under line of credit	(67,900)	(38,100)
DIP financing costs	0	990
Intercompany borrowings (advances), net		0
Net payments on finance leases	(3,216)	(2,061)
Employee taxes paid by withholding shares	0	(43)
Bank overdrafts	1,313	(8,733)
Net cash provided by (used in) financing activities	(87,295)	29,473
Net increase (decrease) in cash and cash equivalents	(5,725)	36,423
Cash, restricted cash, and cash equivalents, beginning of period	12,145	571
Cash, restricted cash, and cash equivalents, end of period	$ 6,989	36,994
Consolidating Adjustments [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities		148,563
INVESTING ACTIVITIES:
Capital expenditures		0
Producing properties and other acquisitions		0
Proceeds from disposition of property and equipment		0
Net cash provided by (used in) investing activities		0
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility		0
Payments under line of credit		0
DIP financing costs		0
Intercompany borrowings (advances), net		(148,563)
Net payments on finance leases		0
Employee taxes paid by withholding shares		0
Bank overdrafts		0
Net cash provided by (used in) financing activities		(148,563)
Net increase (decrease) in cash and cash equivalents		0
Cash, restricted cash, and cash equivalents, beginning of period		0
Cash, restricted cash, and cash equivalents, end of period		0
Parent [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities		(201,699)
INVESTING ACTIVITIES:
Capital expenditures		(760)
Producing properties and other acquisitions		0
Proceeds from disposition of property and equipment		1,169
Net cash provided by (used in) investing activities		409
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility		47,300
Payments under line of credit		(23,500)
DIP financing costs		990
Intercompany borrowings (advances), net		198,503
Net payments on finance leases		0
Employee taxes paid by withholding shares		(43)
Bank overdrafts		(7,269)
Net cash provided by (used in) financing activities		214,001
Net increase (decrease) in cash and cash equivalents		12,711
Cash, restricted cash, and cash equivalents, beginning of period		503
Cash, restricted cash, and cash equivalents, end of period		13,214
Combined Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities		59,486
INVESTING ACTIVITIES:
Capital expenditures		(13,428)
Producing properties and other acquisitions		(210)
Proceeds from disposition of property and equipment		3,253
Net cash provided by (used in) investing activities		(10,385)
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility		0
Payments under line of credit		0
DIP financing costs		0
Intercompany borrowings (advances), net		(49,169)
Net payments on finance leases		0
Employee taxes paid by withholding shares		0
Bank overdrafts		0
Net cash provided by (used in) financing activities		(49,169)
Net increase (decrease) in cash and cash equivalents		(68)
Cash, restricted cash, and cash equivalents, beginning of period		68
Cash, restricted cash, and cash equivalents, end of period		0
Combined Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities		20,117
INVESTING ACTIVITIES:
Capital expenditures		(9,616)
Producing properties and other acquisitions		0
Proceeds from disposition of property and equipment		75
Net cash provided by (used in) investing activities		(9,541)
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility		32,100
Payments under line of credit		(14,600)
DIP financing costs		0
Intercompany borrowings (advances), net		(771)
Net payments on finance leases		(2,061)
Employee taxes paid by withholding shares		0
Bank overdrafts		(1,464)
Net cash provided by (used in) financing activities		13,204
Net increase (decrease) in cash and cash equivalents		23,780
Cash, restricted cash, and cash equivalents, beginning of period		0
Cash, restricted cash, and cash equivalents, end of period		$ 23,780