XML 98 R64.htm IDEA: XBRL DOCUMENT v2.4.1.9
Asset Retirement Obligaion (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Asset retirement obligation    
Asset retirement obligation - beginning balance $ 195,568us-gaap_AssetRetirementObligation [1] $ 179,607us-gaap_AssetRetirementObligation
Additional liabilities accrued 2,507us-gaap_AssetRetirementObligationLiabilitiesIncurred 635us-gaap_AssetRetirementObligationLiabilitiesIncurred
Revisions in estimated cash outflows (2,792)us-gaap_AssetRetirementObligationRevisionOfEstimate 6,268us-gaap_AssetRetirementObligationRevisionOfEstimate
Disposition of assets (44,403)us-gaap_AssetRetirementObligationLiabilitiesSettled (3,534)us-gaap_AssetRetirementObligationLiabilitiesSettled
Accretion expense 12,534us-gaap_AssetRetirementObligationAccretionExpense 12,592us-gaap_AssetRetirementObligationAccretionExpense
Transferred to Liabilities held for sale (10,902)usm_LiabilitiesHeldForSaleAroTransferred  
Asset retirement obligation - ending balance 152,512us-gaap_AssetRetirementObligation [1] 195,568us-gaap_AssetRetirementObligation [1]
Other current liabilities    
Asset retirement obligation    
Asset retirement obligation - ending balance $ 5,900us-gaap_AssetRetirementObligation
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
$ 37,700us-gaap_AssetRetirementObligation
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
[1] The total amount of asset retirement obligations related to the Divestiture Transaction included in Other current liabilities was $5.9 million and $37.7 million as of December 31, 2014 and 2013, respectively.