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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income (loss) $ (55,516)us-gaap_ProfitLoss $ 76,449us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to cash (used in) provided by operating activities:    
Depreciation and amortization (other than multi-client library) 6,525us-gaap_DepreciationAndAmortization 7,904us-gaap_DepreciationAndAmortization
Amortization of multi-client library 5,289io_AmortizationOfMultiClientLibrary 16,326io_AmortizationOfMultiClientLibrary
Stock-based compensation expense 1,480us-gaap_ShareBasedCompensation 2,777us-gaap_ShareBasedCompensation
Equity in losses of investments 0us-gaap_IncomeLossFromEquityMethodInvestments 1,688us-gaap_IncomeLossFromEquityMethodInvestments
Reduction of accrual for loss contingency related to legal proceedings 0us-gaap_LossContingencyAccrualProvision (69,557)us-gaap_LossContingencyAccrualProvision
Deferred income taxes (12)us-gaap_DeferredIncomeTaxExpenseBenefit (884)us-gaap_DeferredIncomeTaxExpenseBenefit
Change in operating assets and liabilities:    
Accounts receivable 74,388us-gaap_IncreaseDecreaseInAccountsReceivable 60,646us-gaap_IncreaseDecreaseInAccountsReceivable
Unbilled receivables (1,523)us-gaap_IncreaseDecreaseInUnbilledReceivables (18,945)us-gaap_IncreaseDecreaseInUnbilledReceivables
Inventories (468)us-gaap_IncreaseDecreaseInInventories (144)us-gaap_IncreaseDecreaseInInventories
Accounts payable, accrued expenses and accrued royalties (39,144)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (5,359)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue 3,137us-gaap_IncreaseDecreaseInDeferredRevenue (4,678)us-gaap_IncreaseDecreaseInDeferredRevenue
Other assets and liabilities (862)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (3,541)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash (used in) provided by operating activities (6,706)us-gaap_NetCashProvidedByUsedInOperatingActivities 62,682us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Cash invested in multi-client data library (9,088)io_InvestmentInMultiClientDataLibrary (22,353)io_InvestmentInMultiClientDataLibrary
Purchase of property, plant, equipment and seismic rental assets (11,994)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,997)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Repayment of advance to INOVA Geophysical 0us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt 1,000us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt
Net investment in and advances to OceanGeo B.V. prior to its consolidation 0us-gaap_PaymentsToAcquireEquityMethodInvestments (3,074)us-gaap_PaymentsToAcquireEquityMethodInvestments
Other investing activities 257us-gaap_PaymentsForProceedsFromOtherInvestingActivities 605us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (20,825)us-gaap_NetCashProvidedByUsedInInvestingActivities (25,819)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Borrowings under revolving line of credit 0us-gaap_ProceedsFromLongTermLinesOfCredit 15,000us-gaap_ProceedsFromLongTermLinesOfCredit
Payments on notes payable and long-term debt (2,066)us-gaap_RepaymentsOfLongTermDebt (2,755)us-gaap_RepaymentsOfLongTermDebt
Other financing activities 31us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 166us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash (used in) provided by financing activities (2,035)us-gaap_NetCashProvidedByUsedInFinancingActivities 12,411us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of change in foreign currency exchange rates on cash and cash equivalents 396us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (24)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease) increase in cash and cash equivalents (29,170)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 49,250us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 173,608us-gaap_CashAndCashEquivalentsAtCarryingValue 148,056us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 144,438us-gaap_CashAndCashEquivalentsAtCarryingValue $ 197,306us-gaap_CashAndCashEquivalentsAtCarryingValue