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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 36,959us-gaap_NetIncomeLoss $ 51,351us-gaap_NetIncomeLoss $ 48,879us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities-      
Depreciation 14,084us-gaap_Depreciation 18,633us-gaap_Depreciation 22,286us-gaap_Depreciation
Amortization 33,553us-gaap_AdjustmentForAmortization 37,819us-gaap_AdjustmentForAmortization 44,178us-gaap_AdjustmentForAmortization
Amortization of original issue discount 5,781us-gaap_AmortizationOfDebtDiscountPremium 5,352us-gaap_AmortizationOfDebtDiscountPremium 4,954us-gaap_AmortizationOfDebtDiscountPremium
Impairment of client contract     3,783us-gaap_AssetImpairmentCharges
(Gain) loss on short-term investments and other 1,123us-gaap_GainLossOnInvestments 910us-gaap_GainLossOnInvestments (107)us-gaap_GainLossOnInvestments
(Gain) loss on disposition of business operations (222)us-gaap_GainLossOnSaleOfBusiness 3,017us-gaap_GainLossOnSaleOfBusiness  
Loss on termination of pension plan   3,221us-gaap_PensionAndOtherPostretirementBenefitExpense  
Deferred income taxes 41us-gaap_DeferredIncomeTaxExpenseBenefit (1,764)us-gaap_DeferredIncomeTaxExpenseBenefit (10,707)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefit of stock-based compensation awards (2,060)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (677)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (415)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Stock-based employee compensation 16,655us-gaap_ShareBasedCompensation 14,796us-gaap_ShareBasedCompensation 13,431us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities, net of acquired amounts:      
Trade accounts receivable, net (14,326)us-gaap_IncreaseDecreaseInAccountsReceivable (2,319)us-gaap_IncreaseDecreaseInAccountsReceivable (9,481)us-gaap_IncreaseDecreaseInAccountsReceivable
Other current and non-current assets (3,230)us-gaap_IncreaseDecreaseInOtherOperatingAssets (7,163)us-gaap_IncreaseDecreaseInOtherOperatingAssets (1,715)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Income taxes payable/receivable (3,508)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable 4,556us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable (6,543)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
Trade accounts payable and accrued liabilities 4,359us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (994)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 18,474us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue (5,558)us-gaap_IncreaseDecreaseInDeferredRevenue (104)us-gaap_IncreaseDecreaseInDeferredRevenue 425us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by operating activities 83,651us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 126,634us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 127,442us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Purchases of property and equipment (25,985)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (30,076)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (33,221)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of short-term investments (190,427)us-gaap_PaymentsToAcquireShortTermInvestments (183,575)us-gaap_PaymentsToAcquireShortTermInvestments (65,355)us-gaap_PaymentsToAcquireShortTermInvestments
Proceeds from sale/maturity of short-term investments 197,466us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments 89,688us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments 42,063us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
Acquisition of businesses, net of cash acquired   (2,926)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (19,085)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Acquisition of and investments in client contracts (5,600)us-gaap_PaymentsToAcquireIntangibleAssets (7,092)us-gaap_PaymentsToAcquireIntangibleAssets (4,629)us-gaap_PaymentsToAcquireIntangibleAssets
Proceeds from the disposition of business operations 1,130us-gaap_ProceedsFromDivestitureOfBusinesses 4,530us-gaap_ProceedsFromDivestitureOfBusinesses  
Net cash used in investing activities (23,416)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (129,451)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (80,227)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Proceeds from issuance of common stock 1,394us-gaap_ProceedsFromIssuanceOfCommonStock 1,591us-gaap_ProceedsFromIssuanceOfCommonStock 1,896us-gaap_ProceedsFromIssuanceOfCommonStock
Payment of cash dividends (20,530)us-gaap_PaymentsOfDividends (14,454)us-gaap_PaymentsOfDividends  
Repurchase of common stock (25,138)us-gaap_PaymentsForRepurchaseOfCommonStock (15,478)us-gaap_PaymentsForRepurchaseOfCommonStock (16,558)us-gaap_PaymentsForRepurchaseOfCommonStock
Payments on acquired equipment financing (1,097)us-gaap_RepaymentsOfNotesPayable (2,723)us-gaap_RepaymentsOfNotesPayable (1,698)us-gaap_RepaymentsOfNotesPayable
Proceeds from long-term debt     150,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
Payments on long-term debt (15,000)us-gaap_RepaymentsOfLongTermDebt (15,000)us-gaap_RepaymentsOfLongTermDebt (190,000)us-gaap_RepaymentsOfLongTermDebt
Payments of deferred financing costs     (2,450)us-gaap_PaymentsOfFinancingCosts
Excess tax benefit of stock-based compensation awards 2,060us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 677us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 415us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash used in financing activities (58,311)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (45,387)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (58,395)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate fluctuations on cash (2,898)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (2,857)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (1,806)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net decrease in cash and cash equivalents (974)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (51,061)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (12,986)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 82,686us-gaap_CashAndCashEquivalentsAtCarryingValue 133,747us-gaap_CashAndCashEquivalentsAtCarryingValue 146,733us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 81,712us-gaap_CashAndCashEquivalentsAtCarryingValue 82,686us-gaap_CashAndCashEquivalentsAtCarryingValue 133,747us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the year for-      
Interest 8,265us-gaap_InterestPaid 9,440us-gaap_InterestPaid 13,124us-gaap_InterestPaid
Income taxes $ 25,153us-gaap_IncomeTaxesPaid $ 6,149us-gaap_IncomeTaxesPaid $ 43,739us-gaap_IncomeTaxesPaid