Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment [Abstract]
Wells and production facilities	$ 28,874	$ 34,725
Proved properties	386,196	386,196
Work in progress and other	86,634
Oilfield assets	501,704	420,921
Accumulated depletion	(74,909)	(65,893)
Oilfield assets, net	426,795	355,028
Unevaluated leaseholds	8,240	8,240
Oil and gas properties, net	435,035	363,268
Other property and equipment	1,590us-gaap_PropertyPlantAndEquipmentOther	989us-gaap_PropertyPlantAndEquipmentOther
Accumulated depreciation	(838)	(533)
Other property and equipment, net	752	456
Total property, plant and equipment, net	$ 435,787us-gaap_PropertyPlantAndEquipmentNet	$ 363,724us-gaap_PropertyPlantAndEquipmentNet

Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

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The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation.

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Net amount of capitalized costs relating to oil and gas producing activities.

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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Capitalized costs of which include those incurred to (1) drill and equip wells that are not yet completed (2) acquire or construct equipment and facilities that are not yet installed.

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Capitalized costs which include those incurred to (1) to drill and equip those exploratory wells and exploratory-type stratigraphic test wells that have found proved reserves and (2) obtain access to proved reserves and provide facilities for extracting, treating, gathering, storing the oil and gas, including the drilling and equipping of development wells and development-type stratigraphic wells and service wells.

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Oil and gas properties net of accumulated depreciation, depletion, amortization, impairment, and abandonment, carried under the successful effort method.

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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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Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale.

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The cumulative amount of depreciation (related to capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy) that has been recognized in the income statement.

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The net amount of capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy.

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

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-Glossary Unproved Properties

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