Supplemental Oil And Gas Disclosures (Schedule Of Capitalized Costs And Costs Incurred On Oil And Gas Properties) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Capitalized costs:
Proved properties	$ 4,990,753	$ 4,235,712	$ 3,822,381
Unproved properties not being amortized	485,568	545,588	521,659
Capitalized costs gross	5,476,321	4,781,300	4,344,040
Accumulated depreciation, depletion, amortization, and impairment	(2,786,678)	(2,439,458)	(2,216,787)
Net capitalized costs	2,689,643	2,341,842	2,127,253
Costs incurred:
Unproved properties acquired	76,041	76,304	420,467
Proved properties acquired	5,723	0	225,669
Exploration	68,811us-gaap_CostsIncurredExplorationCosts	33,373us-gaap_CostsIncurredExplorationCosts	46,467us-gaap_CostsIncurredExplorationCosts
Development	615,252us-gaap_CostsIncurredDevelopmentCosts	424,314us-gaap_CostsIncurredDevelopmentCosts	390,649us-gaap_CostsIncurredDevelopmentCosts
Asset retirement obligation	(37,687)	(17,951)	45,097
Total costs incurred	$ 728,140unt_CapitalExpenditureOilAndNaturalGas	$ 516,040unt_CapitalExpenditureOilAndNaturalGas	$ 1,128,349unt_CapitalExpenditureOilAndNaturalGas

Capital expenditure oil and natural gas

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

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The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

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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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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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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

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Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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