Properties and Equipment (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Mar. 31, 2018 USD ($)	Jun. 30, 2018 USD ($) Wells	Dec. 31, 2017 USD ($) Wells
Property, Plant and Equipment [Line Items]
Proved Natural Gas and Crude Oil Properties		$ 4,944,476	$ 4,356,922
Unproved Natural Gas and Crude Oil Properties		908,271	1,097,317
Total Natural Gas and Crude Oil Properties		5,852,747	5,454,239
Equipment and other		127,799	109,359
Land and Buildings		12,724	10,960
Construction in Progress		294,669	196,024
Properties and equipment, at cost		6,287,939	5,770,582
Accumulated DD&A		(2,095,331)	(1,837,115)
Property, Plant and Equipment, Net		4,192,608	3,933,467
Capitalized Exploratory Well Costs	$ 15,448	15,448
Capitalized Exploratory Well Cost, Additions Pending Determination of Proved Reserves		23,443	51,776
Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves		(29,883)	(36,328)
Capitalized Exploratory Well Costs		$ 9,008	$ 15,448
Wells to be completed \| Wells		1	3
Delaware Basin Unproved Property Impairment	$ 6,300

Delaware Basin Unproved Property Impairment

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Capitalized costs incurred for support equipment and facilities used in oil and gas producing activities (such as seismic equipment, drilling equipment, construction and grading equipment, vehicles, repair shops, warehouses, supply points, camps, and division, district, or field offices).

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Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Oil and Gas properties, gross, carried under the successful effort method.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Oil and Gas properties with proved reserves under the successful effort method.

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Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found.

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