Supplemental Condensed Consolidated Financial Information (Condensed Consolidating Statements of Cash Flows (Unaudited)) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$ 26,467	$ 127,501
INVESTING ACTIVITIES:
Capital expenditures	(23,804)	(246,638)
Producing properties and other acquisitions	(210)	(3,313)
Proceeds from disposition of property and equipment	4,497	7,340
Net cash provided by (used in) investing activities	(19,517)	(242,611)
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility	79,400	271,200
Payments under line of credit	(38,100)	(160,200)
DIP financing costs	990	0
Intercompany borrowings (advances), net	0	0
Net payments on finance leases	(2,061)	(1,980)
Employee taxes paid by withholding shares	(43)	(4,073)
Distributions to non-controlling interest	0	(918)
Bank overdrafts	(8,733)	5,298
Net cash provided by (used in) financing activities	29,473	109,327
Net increase (decrease) in cash and cash equivalents	36,423	(5,783)
Cash and cash equivalents, beginning of period	571	6,452
Cash and cash equivalents, end of period	36,994	669
Consolidating Adjustments [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	148,563	(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	(148,563)	34
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	(148,563)	34
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Parent [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	(201,699)	(8,023)
INVESTING ACTIVITIES:
Capital expenditures	(760)	(100)
Producing properties and other acquisitions	0	0
Proceeds from disposition of property and equipment	1,169	10
Net cash provided by (used in) investing activities	409	(90)
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility	47,300	238,800
Payments under line of credit	(23,500)	(135,300)
DIP financing costs	990
Intercompany borrowings (advances), net	198,503	(96,311)
Net payments on finance leases	0	0
Employee taxes paid by withholding shares	(43)	(4,073)
Distributions to non-controlling interest		919
Bank overdrafts	(7,269)	4,183
Net cash provided by (used in) financing activities	214,001	8,218
Net increase (decrease) in cash and cash equivalents	12,711	105
Cash and cash equivalents, beginning of period	503	403
Cash and cash equivalents, end of period	13,214	508
Combined Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	59,486	111,615
INVESTING ACTIVITIES:
Capital expenditures	(13,428)	(212,982)
Producing properties and other acquisitions	(210)	(3,313)
Proceeds from disposition of property and equipment	3,253	7,247
Net cash provided by (used in) investing activities	(10,385)	(209,048)
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	(49,169)	97,384
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	(49,169)	97,384
Net increase (decrease) in cash and cash equivalents	(68)	(49)
Cash and cash equivalents, beginning of period	68	208
Cash and cash equivalents, end of period	0	159
Combined Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	20,117	23,943
INVESTING ACTIVITIES:
Capital expenditures	(9,616)	(33,556)
Producing properties and other acquisitions	0	0
Proceeds from disposition of property and equipment	75	83
Net cash provided by (used in) investing activities	(9,541)	(33,473)
FINANCING ACTIVITIES:
Borrowings under line of credit, including borrowings under DIP credit facility	32,100	32,400
Payments under line of credit	(14,600)	(24,900)
DIP financing costs	0
Intercompany borrowings (advances), net	(771)	(1,107)
Net payments on finance leases	(2,061)	(1,980)
Employee taxes paid by withholding shares	0	0
Distributions to non-controlling interest		(1,837)
Bank overdrafts	(1,464)	1,115
Net cash provided by (used in) financing activities	13,204	3,691
Net increase (decrease) in cash and cash equivalents	23,780	(5,839)
Cash and cash equivalents, beginning of period	0	5,841
Cash and cash equivalents, end of period	$ 23,780	$ 2