Supplemental Condensed Consolidated Financial Information (Condensed Consolidating Statements of Cash Flows (Unaudited)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING ACTIVITIES:
Net cash provided by (used in) 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 provided by (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)
Intercompany borrowings (advances), net	0	0
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 (used in) 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
Consolidating Adjustments [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	0	(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	0	0
Payments under line of credit	0	0
Intercompany borrowings (advances), net	0	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	0	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	(66,578)	3,548
INVESTING ACTIVITIES:
Capital expenditures	(421)	(321)
Producing properties and other acquisitions	0	0
Proceeds from disposition of property and equipment	0	10
Net cash provided by (used in) investing activities	(421)	(311)
FINANCING ACTIVITIES:
Borrowings under line of credit	39,300	106,900
Payments under line of credit	(23,500)	(66,900)
Intercompany borrowings (advances), net	75,016	(43,103)
Net payments on finance leases	0	0
Employee taxes paid by withholding shares	(43)	(4,110)
Distributions to non-controlling interest		919
Bank overdrafts	(7,269)	3,161
Net cash provided by (used in) financing activities	83,504	(3,133)
Net increase (decrease) in cash and cash equivalents	16,505	104
Cash and cash equivalents, beginning of period	503	403
Cash and cash equivalents, end of period	17,008	507
Combined Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	86,663	64,168
INVESTING ACTIVITIES:
Capital expenditures	(13,051)	(110,089)
Producing properties and other acquisitions	(210)	(1,580)
Proceeds from disposition of property and equipment	1,700	3,142
Net cash provided by (used in) investing activities	(11,561)	(108,527)
FINANCING ACTIVITIES:
Borrowings under line of credit	0	0
Payments under line of credit	0	0
Intercompany borrowings (advances), net	(75,089)	44,407
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	(75,089)	44,407
Net increase (decrease) in cash and cash equivalents	13	48
Cash and cash equivalents, beginning of period	68	208
Cash and cash equivalents, end of period	81	256
Combined Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	9,827	13,506
INVESTING ACTIVITIES:
Capital expenditures	(4,056)	(12,097)
Producing properties and other acquisitions	0	0
Proceeds from disposition of property and equipment	51	38
Net cash provided by (used in) investing activities	(4,005)	(12,059)
FINANCING ACTIVITIES:
Borrowings under line of credit	32,100	2,900
Payments under line of credit	(11,600)	(2,900)
Intercompany borrowings (advances), net	73	(1,338)
Net payments on finance leases	(1,026)	(985)
Employee taxes paid by withholding shares	0	0
Distributions to non-controlling interest		(1,837)
Bank overdrafts	(1,464)	0
Net cash provided by (used in) financing activities	18,083	(4,160)
Net increase (decrease) in cash and cash equivalents	23,905	(2,713)
Cash and cash equivalents, beginning of period	0	5,841
Cash and cash equivalents, end of period	$ 23,905	$ 3,128