Condensed Consolidating Financial Information - Summary of Condensed Consolidating Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$ 110,232	$ 41,122
Cash flows from investing activities:
Exploration, development, and other capital expenditures	(83,588)	(102,396)
Cash paid for acquisitions, net of cash acquired	(293,095)	(32,916)
Net cash provided by (used in) investing activities	(376,683)	(135,312)
Cash flows from financing activities:
Proceeds from Bank Credit Facility	300,000	35,000
Deferred financing costs	(1,285)
Other deferred payments	(7,575)	(6,575)
Payment of capital lease	(4,049)	(3,311)
Employee stock transactions	(710)
Net cash provided by (used in) financing activities	286,381	5
Redemption of Senior Notes and other long-term debt		(109)
Repayment of Bank Credit Facility		(25,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	19,930	(94,185)
Cash, cash equivalents and restricted cash:
Balance, beginning of period	87,022	141,162
Balance, end of period	106,952	46,977
Parent
Cash flows from operating activities:
Net cash provided by (used in) operating activities	3	(207)
Cash flows from financing activities:
Capital contributions		207
Distributions to Subsidiary Issuer	(3)
Net cash provided by (used in) financing activities	(3)	207
Subsidiary Issuer
Cash flows from operating activities:
Net cash provided by (used in) operating activities	(6,781)	(9,279)
Cash flows from investing activities:
Exploration, development, and other capital expenditures	(1,604)	(1,036)
Investments in subsidiaries	(570,118)	(441,484)
Distributions from subsidiaries	289,461	451,174
Net cash provided by (used in) investing activities	(282,261)	8,654
Cash flows from financing activities:
Proceeds from Bank Credit Facility	300,000	35,000
Deferred financing costs	(1,285)
Net cash provided by (used in) financing activities	298,715	10,000
Repayment of Bank Credit Facility		(25,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	9,673	9,375
Cash, cash equivalents and restricted cash:
Balance, beginning of period	78,780	13,541
Balance, end of period	88,453	22,916
Guarantors
Cash flows from operating activities:
Net cash provided by (used in) operating activities	117,271	72,999
Cash flows from investing activities:
Exploration, development, and other capital expenditures	(79,194)	(94,144)
Cash paid for acquisitions, net of cash acquired	(293,095)	(32,916)
Net cash provided by (used in) investing activities	(372,289)	(127,060)
Cash flows from financing activities:
Other deferred payments	(7,575)	(6,575)
Payment of capital lease	(4,049)	(3,311)
Employee stock transactions	(710)
Capital contributions	560,618	421,277
Distributions to Subsidiary Issuer	(288,628)	(450,912)
Net cash provided by (used in) financing activities	259,656	(39,630)
Redemption of Senior Notes and other long-term debt		(109)
Net increase (decrease) in cash, cash equivalents and restricted cash	4,638	(93,691)
Cash, cash equivalents and restricted cash:
Balance, beginning of period	593	102,049
Balance, end of period	5,231	8,358
Non-Guarantors
Cash flows from operating activities:
Net cash provided by (used in) operating activities	(261)	(22,391)
Cash flows from investing activities:
Exploration, development, and other capital expenditures	(2,790)	(7,216)
Net cash provided by (used in) investing activities	(2,790)	(7,216)
Cash flows from financing activities:
Capital contributions	9,500	20,000
Distributions to Subsidiary Issuer	(830)	(262)
Net cash provided by (used in) financing activities	8,670	19,738
Net increase (decrease) in cash, cash equivalents and restricted cash	5,619	(9,869)
Cash, cash equivalents and restricted cash:
Balance, beginning of period	7,649	25,572
Balance, end of period	13,268	15,703
Elimination
Cash flows from investing activities:
Investments in subsidiaries	570,118	441,484
Distributions from subsidiaries	(289,461)	(451,174)
Net cash provided by (used in) investing activities	280,657	(9,690)
Cash flows from financing activities:
Capital contributions	(570,118)	(441,484)
Distributions to Subsidiary Issuer	289,461	451,174
Net cash provided by (used in) financing activities	$ (280,657)	$ 9,690

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