Subsidiary Guarantor Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Net Cash Provided by (Used in) Operating Activities	$ 675,725	$ 577,834
Payments to Explore and Develop Oil and Gas Properties	(780,581)	(685,549)
Payments for Capital Improvements	(15,522)	(3,739)
Payments to Acquire Businesses, Net of Cash Acquired	(12,445)	(181,572)
Proceeds from sale of properties and equipment	1,528	2,443
Proceeds from Divestiture of Businesses	202,046	43,493
Increase (Decrease) in Restricted Cash	8,001	1,249
intercompany Transfer Investing Activities	0	0
Net Cash Provided by (Used in) Investing Activities	(596,973)	(823,675)
Proceeds from Lines of Credit	1,300,000	629,000
Repayment of revolving credit facility	(1,235,500)	(554,000)
Payments of Debt Issuance Costs	(53)	(4,086)
Stock Repurchased During Period, Value	(142,665)
Payments for Repurchase of Common Stock	(3,874)	(4,700)
Finance Lease, Principal Payments	(1,492)	(873)
Other	0	(55)
Intercompany Transfers Financing Activities	0	0
Net Cash Provided by (Used in) Financing Activities	(83,584)	65,286
Net change in cash, cash equivalents, and restricted cash	(4,832)	(180,555)
Cash, cash equivalents and restricted cash, beginning of period	9,399	189,925
Cash, cash equivalents and restricted cash, end of period	4,567	9,370
Corporate, Non-Segment [Member]
Net Cash Provided by (Used in) Operating Activities	436,397	405,326
Payments to Explore and Develop Oil and Gas Properties	(445,448)	(360,457)
Payments for Capital Improvements	(15,192)	(2,834)
Payments to Acquire Businesses, Net of Cash Acquired	(11,379)	(181,501)
Proceeds from sale of properties and equipment	153	1,918
Proceeds from Divestiture of Businesses	5,485	43,493
Increase (Decrease) in Restricted Cash	8,001	1,249
intercompany Transfer Investing Activities	97,908	(153,121)
Net Cash Provided by (Used in) Investing Activities	(360,472)	(651,253)
Proceeds from Lines of Credit	1,300,000	629,000
Repayment of revolving credit facility	(1,235,500)	(554,000)
Payments of Debt Issuance Costs	53	4,086
Stock Repurchased During Period, Value	(142,665)
Payments for Repurchase of Common Stock	(3,874)	(4,700)
Finance Lease, Principal Payments	(1,264)	(787)
Other		(55)
Intercompany Transfers Financing Activities	0	0
Net Cash Provided by (Used in) Financing Activities	(83,356)	65,372
Net change in cash, cash equivalents, and restricted cash	(7,431)	(180,555)
Cash, cash equivalents and restricted cash, beginning of period	9,399	189,925
Cash, cash equivalents and restricted cash, end of period	1,968	9,370
Reportable Legal Entities [Member]
Net Cash Provided by (Used in) Operating Activities	239,328	172,508
Payments to Explore and Develop Oil and Gas Properties	(335,133)	(325,092)
Payments for Capital Improvements	(330)	(905)
Payments to Acquire Businesses, Net of Cash Acquired	(1,066)	71
Proceeds from sale of properties and equipment	1,375	525
Proceeds from Divestiture of Businesses	196,561	0
Increase (Decrease) in Restricted Cash	0	0
intercompany Transfer Investing Activities	0	0
Net Cash Provided by (Used in) Investing Activities	(138,593)	(325,543)
Proceeds from Lines of Credit	0	0
Repayment of revolving credit facility	0	0
Payments of Debt Issuance Costs	0	0
Stock Repurchased During Period, Value	0
Payments for Repurchase of Common Stock	0	0
Finance Lease, Principal Payments	(228)	(86)
Other		0
Intercompany Transfers Financing Activities	(97,908)	153,121
Net Cash Provided by (Used in) Financing Activities	(98,136)	153,035
Net change in cash, cash equivalents, and restricted cash	2,599	0
Cash, cash equivalents and restricted cash, beginning of period	0	0
Cash, cash equivalents and restricted cash, end of period	2,599	0
Consolidation, Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities	0	0
Payments to Explore and Develop Oil and Gas Properties	0	0
Payments for Capital Improvements	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0	0
Proceeds from sale of properties and equipment	0	0
Proceeds from Divestiture of Businesses	0	0
Increase (Decrease) in Restricted Cash	0	0
intercompany Transfer Investing Activities	(97,908)	153,121
Net Cash Provided by (Used in) Investing Activities	(97,908)	153,121
Proceeds from Lines of Credit	0	0
Repayment of revolving credit facility	0	0
Payments of Debt Issuance Costs	0	0
Stock Repurchased During Period, Value	0
Payments for Repurchase of Common Stock	0	0
Finance Lease, Principal Payments	0	0
Other		0
Intercompany Transfers Financing Activities	97,908	(153,121)
Net Cash Provided by (Used in) Financing Activities	97,908	(153,121)
Net change in cash, cash equivalents, and restricted cash	0	0
Cash, cash equivalents and restricted cash, beginning of period	0	0
Cash, cash equivalents and restricted cash, end of period	$ 0	$ 0

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Amount of cash outflow for principal payment on finance lease.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas).

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