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11. INCOME TAXES (Details - Deferred tax assets and liabilities) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Net operating losses $ 87,709us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 82,630us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accrued expenses 3,594us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 3,610us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Straight-Line Rent Adjustment 8,897rdnt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRentAdjustment 8,053rdnt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRentAdjustment
Unfavorable contract liability 2,811us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 3,365us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Equity compensation 253us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 645us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Allowance for doubtful accounts 2,124us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 2,494us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Other 1,891us-gaap_DeferredTaxAssetsOther 1,400us-gaap_DeferredTaxAssetsOther
Valuation allowance (6,378)us-gaap_DeferredTaxAssetsValuationAllowance (6,593)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 100,901us-gaap_DeferredTaxAssetsGross 95,604us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Property & equipment (7,755)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (7,948)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Goodwill (17,833)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill (15,101)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill
Intangibles (12,105)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (12,162)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
NAEM Reserve (6,441)us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts (555)us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts
Other (4,189)us-gaap_DeferredTaxLiabilitiesOther (1,603)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (48,323)us-gaap_DeferredTaxLiabilities (42,369)us-gaap_DeferredTaxLiabilities
Net Deferred Tax Asset $ 52,578us-gaap_DeferredTaxAssetsLiabilitiesNet $ 53,235us-gaap_DeferredTaxAssetsLiabilitiesNet