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v2.4.1.9

Income Taxes, Components of Deferred Income Tax (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets |  |
Current deferred tax assets | $ 96,886 us-gaap_DeferredTaxAssetsGrossCurrent | $ 102,088 us-gaap_DeferredTaxAssetsGrossCurrent
Net operating loss ("NOL") carryforwards | 72,878 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 61,294 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Stock-based compensation | 21,072 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 19,028 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Compensation and benefits - other | 2,586 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther | 3,746 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Deferred rent | 18,513 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent | 19,462 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent
Other | 26,116 us-gaap_DeferredTaxAssetsOther | 24,604 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 238,051 us-gaap_DeferredTaxAssetsGross | 230,222 us-gaap_DeferredTaxAssetsGross
Less valuation allowance | (53,119)us-gaap_DeferredTaxAssetsValuationAllowance | (43,375)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets | 184,932 us-gaap_DeferredTaxAssetsNet | 186,847 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities |  |
Property, plant and equipment | 520,723 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 503,491 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Licenses/intangibles | 275,456 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | 282,764 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Partnership investments | 149,371 usm_DeferredTaxLiabilitiesInvestmentInAffiliates | 133,931 usm_DeferredTaxLiabilitiesInvestmentInAffiliates
Other | 4,135 us-gaap_DeferredTaxLiabilitiesOther | 3,853 us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | 949,685 us-gaap_DeferredIncomeTaxLiabilities | 924,039 us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax liability | $ 764,753 us-gaap_DeferredTaxLiabilities | $ 737,192 us-gaap_DeferredTaxLiabilities

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