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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (4,476)us-gaap_ProfitLoss $ (12,375)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 14,294us-gaap_DepreciationAndAmortization 15,571us-gaap_DepreciationAndAmortization
Provision for bad debts 7,475us-gaap_ProvisionForDoubtfulAccounts 6,893us-gaap_ProvisionForDoubtfulAccounts
Equity in earnings of joint ventures (1,102)us-gaap_IncomeLossFromEquityMethodInvestments (1,067)us-gaap_IncomeLossFromEquityMethodInvestments
Distributions from joint ventures 3,041us-gaap_EquityMethodInvestmentDividendsOrDistributions 1,866us-gaap_EquityMethodInvestmentDividendsOrDistributions
Deferred rent amortization 925rdnt_DeferredRentAmortization 343rdnt_DeferredRentAmortization
Amortization and write off of deferred financing costs and loan discount 1,288us-gaap_AmortizationOfFinancingCosts 1,833us-gaap_AmortizationOfFinancingCosts
(Gain) loss on sale and disposal of equipment (38)us-gaap_GainLossOnSaleOfPropertyPlantEquipment 246us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Loss on early extinguishment of Senior Notes 0us-gaap_ExtinguishmentOfDebtGainLossNetOfTax 15,456us-gaap_ExtinguishmentOfDebtGainLossNetOfTax
Stock-based compensation 3,554us-gaap_ShareBasedCompensation 1,025us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (12,498)us-gaap_IncreaseDecreaseInAccountsReceivable (13,923)us-gaap_IncreaseDecreaseInAccountsReceivable
Other current assets 2,787us-gaap_IncreaseDecreaseInOtherCurrentAssets (4,503)us-gaap_IncreaseDecreaseInOtherCurrentAssets
Other assets (289)us-gaap_IncreaseDecreaseInOtherOperatingAssets (575)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Deferred taxes (3,578)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes (4,536)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Deferred revenue (202)us-gaap_IncreaseDecreaseInDeferredRevenue (39)us-gaap_IncreaseDecreaseInDeferredRevenue
Accounts payable, accrued expenses and other 6,288us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (11,075)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net cash provided by (used in) operating activities 17,469us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (4,860)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities 0us-gaap_PaymentsToAcquireProductiveAssets (360)us-gaap_PaymentsToAcquireProductiveAssets
Purchase of property and equipment (19,826)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (17,047)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of equipment 205us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 4us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Equity contributions in existing and purchase of interest in joint ventures 0us-gaap_PaymentsToAcquireInvestments (789)us-gaap_PaymentsToAcquireInvestments
Net cash used in investing activities (19,621)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (18,192)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (2,030)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities (1,929)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Proceeds from borrowings 0us-gaap_ProceedsFromIssuanceOfDebt 210,000us-gaap_ProceedsFromIssuanceOfDebt
Payments on Term Loan Debt/Senior Notes (5,190)us-gaap_RepaymentsOfDebt (204,468)us-gaap_RepaymentsOfDebt
Deferred financing costs 0us-gaap_PaymentsOfDebtIssuanceCosts (6,650)us-gaap_PaymentsOfDebtIssuanceCosts
Net proceeds on revolving credit facility 9,400us-gaap_ProceedsFromLinesOfCredit 18,100us-gaap_ProceedsFromLinesOfCredit
Distributions paid to noncontrolling interests (468)us-gaap_PaymentsToMinorityShareholders (133)us-gaap_PaymentsToMinorityShareholders
Proceeds from issuance of common stock upon exercise of options/warrants 324us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 29us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Net cash provided by financing activities 2,036us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 14,949us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
EFFECT OF EXCHANGE RATE CHANGES ON CASH (37)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (18)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
NET DECREASE IN CASH AND CASH EQUIVALENTS (153)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (8,121)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS, beginning of period 307us-gaap_CashAndCashEquivalentsAtCarryingValue 8,412us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS, end of period 154us-gaap_CashAndCashEquivalentsAtCarryingValue 291us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash paid during the period for interest 8,624us-gaap_InterestPaid 14,508us-gaap_InterestPaid
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Purchase of equipment and leasehold improvements not yet paid for $ 12,300rdnt_PurchaseOfEquipmentAndLeaseholdImprovementsNotYetPaidFor $ 5,000rdnt_PurchaseOfEquipmentAndLeaseholdImprovementsNotYetPaidFor