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Asset Retirement Obligations (Schedule Of Asset Retirement Obligations) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
ARO liability, January 1: $ 133,657us-gaap_AssetRetirementObligation $ 146,159us-gaap_AssetRetirementObligation
Accretion of discount 4,599us-gaap_AssetRetirementObligationAccretionExpense 5,450us-gaap_AssetRetirementObligationAccretionExpense
Liability incurred 6,246us-gaap_AssetRetirementObligationLiabilitiesIncurred 4,857us-gaap_AssetRetirementObligationLiabilitiesIncurred
Liability settled (4,490)us-gaap_AssetRetirementObligationLiabilitiesSettled (4,751)us-gaap_AssetRetirementObligationLiabilitiesSettled
Liability sold (1,206)unt_AssetRetirementObligationLiabilitiesSold (2,622)unt_AssetRetirementObligationLiabilitiesSold
Revision of estimates (38,239)us-gaap_AssetRetirementObligationRevisionOfEstimate [1] (15,436)us-gaap_AssetRetirementObligationRevisionOfEstimate [1]
ARO liability, December 31: 100,567us-gaap_AssetRetirementObligation 133,657us-gaap_AssetRetirementObligation
Less current portion 3,204us-gaap_AssetRetirementObligationCurrent 2,954us-gaap_AssetRetirementObligationCurrent
Total long-term ARO liability $ 97,363us-gaap_AssetRetirementObligationsNoncurrent $ 130,703us-gaap_AssetRetirementObligationsNoncurrent
[1] Plugging liability estimates were revised in both 2014 and 2013 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downward adjustments as well as changes in estimated timing of cash flows.