Supplemental Condensed Consolidated Financial Information (Condensed Consolidating Statements of Cash Flow) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$ 269,396	$ 352,747	$ 270,088
INVESTING ACTIVITIES:
Capital expeditures	(406,665)	(446,282)	(255,553)
Producing property and other oil and natural gas acquisitions	(3,653)	(29,970)	(58,026)
Payments to Acquire Other Property, Plant, and Equipment	(16,109)	0	0
Proceeds from disposition of property and equipment	31,864	25,910	21,713
Other	0	0	(1,500)
Net cash provided by (used in) investing activities	(394,563)	(450,342)	(293,366)
FINANCING ACTIVITIES:
Borrowings under line of credit	493,500	99,100	343,900
Payments under line of credit	(368,800)	(277,100)	(326,700)
Intercompany borrowings (advances), net	0	0	0
Payments on finance leases	(4,001)	(3,843)	(3,694)
Payments Related to Tax Withholding for Share-based Compensation	(4,158)	(4,988)	(4,132)
Payments to Noncontrolling Interests	(918)	0	0
Proceeds from common stock issued, net of issue costs	0	0	18,623
Proceeds from investments of non-contolling interests	0	300,000	0
Transaction costs associated with sale of non-controlling interest	0	(2,503)	0
Bank overdrafts	3,663	(7,320)	(4,911)
Net cash provided by (used in) financing activities	119,286	103,346	23,086
Net increase (decrease) in cash and cash equivalents	(5,881)	5,751	(192)
Cash and cash equivalents, beginning of year	6,452	701	893
Cash and cash equivalents, end of year	571	6,452	701
Consolidating Adjustments
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	12,338	325,914	0
INVESTING ACTIVITIES:
Capital expeditures	0	0	0
Producing property and other oil and natural gas acquisitions	0	0	0
Payments to Acquire Other Property, Plant, and Equipment	0
Proceeds from disposition of property and equipment	0	0	0
Other			0
Net cash provided by (used in) investing activities	0	0	0
FINANCING ACTIVITIES:
Borrowings under line of credit	0	0	0
Payments under line of credit	0	0	0
Intercompany borrowings (advances), net	(12,338)	(128,080)	0
Payments on finance leases	0	0	0
Payments Related to Tax Withholding for Share-based Compensation	0	0	0
Payments to Noncontrolling Interests	0
Proceeds from common stock issued, net of issue costs			0
Proceeds from investments of non-contolling interests		(197,042)
Transaction costs associated with sale of non-controlling interest		0
Bank overdrafts	0	0	0
Net cash provided by (used in) financing activities	(12,338)	(325,914)	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of year	0	0	0
Cash and cash equivalents, end of year	0	0	0
Parent
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	(9,681)	(310,120)	3,458
INVESTING ACTIVITIES:
Capital expeditures	65	236	(3,594)
Producing property and other oil and natural gas acquisitions	0	0	0
Payments to Acquire Other Property, Plant, and Equipment	0
Proceeds from disposition of property and equipment	11	30	964
Other			0
Net cash provided by (used in) investing activities	76	266	(2,630)
FINANCING ACTIVITIES:
Borrowings under line of credit	400,600	97,100	343,900
Payments under line of credit	(292,400)	(275,100)	(326,700)
Intercompany borrowings (advances), net	(97,455)	202,558	(27,615)
Payments on finance leases	0	0	0
Payments Related to Tax Withholding for Share-based Compensation	(4,158)	(4,988)	(4,132)
Payments to Noncontrolling Interests	919
Proceeds from common stock issued, net of issue costs			18,623
Proceeds from investments of non-contolling interests		300,000
Transaction costs associated with sale of non-controlling interest		(2,503)
Bank overdrafts	2,199	(7,320)	(4,911)
Net cash provided by (used in) financing activities	9,705	309,747	(835)
Net increase (decrease) in cash and cash equivalents	100	(107)	(7)
Cash and cash equivalents, beginning of year	403	510	517
Cash and cash equivalents, end of year	503	403	510
Combined Guarantor Subsidiaries
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	217,883	324,696	223,437
INVESTING ACTIVITIES:
Capital expeditures	(355,258)	(400,990)	(233,254)
Producing property and other oil and natural gas acquisitions	(3,653)	(29,970)	(58,026)
Payments to Acquire Other Property, Plant, and Equipment	0
Proceeds from disposition of property and equipment	31,153	25,777	20,674
Other			(1,500)
Net cash provided by (used in) investing activities	(327,758)	(405,183)	(272,106)
FINANCING ACTIVITIES:
Borrowings under line of credit	0	0	0
Payments under line of credit	0	0	0
Intercompany borrowings (advances), net	109,735	80,504	48,484
Payments on finance leases	0	0	0
Payments Related to Tax Withholding for Share-based Compensation	0	0	0
Payments to Noncontrolling Interests	0
Proceeds from common stock issued, net of issue costs			0
Proceeds from investments of non-contolling interests		0
Transaction costs associated with sale of non-controlling interest		0
Bank overdrafts	0	0	0
Net cash provided by (used in) financing activities	109,735	80,504	48,484
Net increase (decrease) in cash and cash equivalents	(140)	17	(185)
Cash and cash equivalents, beginning of year	208	191	376
Cash and cash equivalents, end of year	68	208	191
Combined Non-Guarantor Subsidiaries
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	48,856	12,257	43,193
INVESTING ACTIVITIES:
Capital expeditures	(51,472)	(45,528)	(18,705)
Producing property and other oil and natural gas acquisitions	0	0	0
Payments to Acquire Other Property, Plant, and Equipment	(16,109)
Proceeds from disposition of property and equipment	700	103	75
Other			0
Net cash provided by (used in) investing activities	(66,881)	(45,425)	(18,630)
FINANCING ACTIVITIES:
Borrowings under line of credit	92,900	2,000	0
Payments under line of credit	(76,400)	(2,000)	0
Intercompany borrowings (advances), net	58	(154,982)	(20,869)
Payments on finance leases	(4,001)	(3,843)	(3,694)
Payments Related to Tax Withholding for Share-based Compensation	0	0	0
Payments to Noncontrolling Interests	(1,837)
Proceeds from common stock issued, net of issue costs			0
Proceeds from investments of non-contolling interests		197,042
Transaction costs associated with sale of non-controlling interest		0
Bank overdrafts	1,464	0	0
Net cash provided by (used in) financing activities	12,184	39,009	(24,563)
Net increase (decrease) in cash and cash equivalents	(5,841)	5,841	0
Cash and cash equivalents, beginning of year	5,841	0	0
Cash and cash equivalents, end of year	$ 0	$ 5,841	$ 0