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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Proved oil and gas properties	$ 7,340,228	$ 7,058,782
Less: Accumulated depreciation, depletion, amortization and impairment	(2,532,668)	(2,395,153)
Proved oil and gas properties, net	4,807,560	4,663,629
Unproved oil and gas properties	1,084,606	780,173
Other property and equipment	1,024,104	868,746
Less: Accumulated depreciation	(159,029)	(139,062)
Other property and equipment, net	865,075	729,684
Total property, plant and equipment, net	$ 6,757,241	$ 6,173,486

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- Definition

Oil and Gas properties with proved reserves under the successful effort method, net of accumulated depreciation, depletion, amortization and impairment.

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Amount of accumulated depreciation, depletion and amortization of oil and gas property carried under the successful effort method. Oil and gas property include, but not limited to, the entity's wells and related equipment and facilities.

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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 unproved reserves under the successful effort method.

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