Condensed Consolidating Financial Information - Summary of Condensed Consolidating Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$ 191,612	$ 182,621
Cash flows from investing activities:
Exploration, development, and other capital expenditures	(154,628)	(229,601)
Cash paid for acquisitions, net of cash acquired	(296,966)	(32,916)
Proceeds from sale of other property and equipment		5,369
Net cash provided by (used in) investing activities	(451,594)	(257,148)
Cash flows from financing activities:
Redemption of Senior Notes and other long-term debt	(1,209)	(10,567)
Proceeds from Bank Credit Facility	300,000	75,000
Repayment of Bank Credit Facility		(25,000)
Deferred financing costs	(1,287)
Other deferred payments	(7,575)	(9,921)
Payment of capital lease	(8,323)	(6,759)
Employee stock transactions	(791)	(283)
Net cash provided by (used in) financing activities	280,815	22,470
Net increase (decrease) in cash, cash equivalents and restricted cash	20,833	(52,057)
Cash, cash equivalents and restricted cash:
Balance, beginning of period	87,022	141,162
Balance, end of period	107,855	89,105
Parent
Cash flows from operating activities:
Net cash provided by (used in) operating activities	(324)	(259)
Cash flows from financing activities:
Capital contributions	331	259
Distributions to Subsidiary Issuer	(7)
Net cash provided by (used in) financing activities	324	259
Subsidiary Issuer
Cash flows from operating activities:
Net cash provided by (used in) operating activities	49,486	(59,988)
Cash flows from investing activities:
Exploration, development, and other capital expenditures	(1,791)	(1,442)
Investments in subsidiaries	(783,703)	(784,698)
Distributions from subsidiaries	462,034	838,920
Net cash provided by (used in) investing activities	(323,460)	52,780
Cash flows from financing activities:
Redemption of Senior Notes and other long-term debt	(1,209)
Proceeds from Bank Credit Facility	300,000	75,000
Repayment of Bank Credit Facility		(25,000)
Deferred financing costs	(1,287)
Employee stock transactions		(283)
Net cash provided by (used in) financing activities	297,504	49,717
Net increase (decrease) in cash, cash equivalents and restricted cash	23,530	42,509
Cash, cash equivalents and restricted cash:
Balance, beginning of period	78,780	13,541
Balance, end of period	102,310	56,050
Guarantors
Cash flows from operating activities:
Net cash provided by (used in) operating activities	154,079	266,802
Cash flows from investing activities:
Exploration, development, and other capital expenditures	(149,621)	(207,340)
Cash paid for acquisitions, net of cash acquired	(296,966)	(32,916)
Proceeds from sale of other property and equipment		5,369
Net cash provided by (used in) investing activities	(446,587)	(234,887)
Cash flows from financing activities:
Redemption of Senior Notes and other long-term debt		(10,567)
Other deferred payments	(7,575)	(9,921)
Payment of capital lease	(8,323)	(6,759)
Employee stock transactions	(791)
Capital contributions	770,872	734,939
Distributions to Subsidiary Issuer	(460,477)	(838,595)
Net cash provided by (used in) financing activities	293,706	(130,903)
Net increase (decrease) in cash, cash equivalents and restricted cash	1,198	(98,988)
Cash, cash equivalents and restricted cash:
Balance, beginning of period	593	102,049
Balance, end of period	1,791	3,061
Non-Guarantors
Cash flows from operating activities:
Net cash provided by (used in) operating activities	(11,629)	(23,934)
Cash flows from investing activities:
Exploration, development, and other capital expenditures	(3,216)	(20,819)
Net cash provided by (used in) investing activities	(3,216)	(20,819)
Cash flows from financing activities:
Capital contributions	12,500	49,500
Distributions to Subsidiary Issuer	(1,550)	(325)
Net cash provided by (used in) financing activities	10,950	49,175
Net increase (decrease) in cash, cash equivalents and restricted cash	(3,895)	4,422
Cash, cash equivalents and restricted cash:
Balance, beginning of period	7,649	25,572
Balance, end of period	3,754	29,994
Elimination
Cash flows from investing activities:
Investments in subsidiaries	783,703	784,698
Distributions from subsidiaries	(462,034)	(838,920)
Net cash provided by (used in) investing activities	321,669	(54,222)
Cash flows from financing activities:
Capital contributions	(783,703)	(784,698)
Distributions to Subsidiary Issuer	462,034	838,920
Net cash provided by (used in) financing activities	$ (321,669)	$ 54,222

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