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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 $ 9,358us-gaap_NetIncomeLoss $ 9,691us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities-    
Depreciation 3,695us-gaap_Depreciation 3,486us-gaap_Depreciation
Amortization 8,217us-gaap_AdjustmentForAmortization 8,590us-gaap_AdjustmentForAmortization
Amortization of original issue discount 1,516us-gaap_AmortizationOfDebtDiscountPremium 1,404us-gaap_AmortizationOfDebtDiscountPremium
Loss on short-term investments and other 91us-gaap_GainLossOnInvestments 453us-gaap_GainLossOnInvestments
Gain on disposition of business operations   (222)us-gaap_GainLossOnSaleOfBusiness
Deferred income taxes 23us-gaap_DeferredIncomeTaxExpenseBenefit 2,772us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefit of stock-based compensation awards (1,796)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (1,974)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Stock-based employee compensation 5,089us-gaap_ShareBasedCompensation 3,783us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities, net of acquired amounts:    
Trade accounts receivable, net (986)us-gaap_IncreaseDecreaseInAccountsReceivable (18,029)us-gaap_IncreaseDecreaseInAccountsReceivable
Other current and non-current assets (1,093)us-gaap_IncreaseDecreaseInOtherOperatingAssets (3,448)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Income taxes payable/receivable 3,338us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable 707us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
Trade accounts payable and accrued liabilities (16,140)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (17,464)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue 7,624us-gaap_IncreaseDecreaseInDeferredRevenue 1,673us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by (used in) operating activities 18,936us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (8,578)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Purchases of property and equipment (6,695)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,499)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of short-term investments (10,085)us-gaap_PaymentsToAcquireShortTermInvestments (40,531)us-gaap_PaymentsToAcquireShortTermInvestments
Proceeds from sale/maturity of short-term investments 49,470us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments 50,855us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
Acquisition of and investments in client contracts (1,223)us-gaap_PaymentsToAcquireIntangibleAssets (1,509)us-gaap_PaymentsToAcquireIntangibleAssets
Proceeds from the disposition of business operations   630us-gaap_ProceedsFromDivestitureOfBusinesses
Net cash used in investing activities 31,467us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 4,946us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Proceeds from issuance of common stock 396us-gaap_ProceedsFromIssuanceOfCommonStock 340us-gaap_ProceedsFromIssuanceOfCommonStock
Payment of cash dividends (5,842)us-gaap_PaymentsOfDividends (5,162)us-gaap_PaymentsOfDividends
Repurchase of common stock (62,753)us-gaap_PaymentsForRepurchaseOfCommonStock (6,518)us-gaap_PaymentsForRepurchaseOfCommonStock
Payments on acquired asset financing (829)us-gaap_RepaymentsOfNotesPayable  
Proceeds from long-term debt 150,000us-gaap_ProceedsFromIssuanceOfLongTermDebt  
Payments on long-term debt (121,875)us-gaap_RepaymentsOfLongTermDebt (3,750)us-gaap_RepaymentsOfLongTermDebt
Payments of deferred financing costs (2,692)us-gaap_PaymentsOfFinancingCosts  
Excess tax benefit of stock-based compensation awards 1,796us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 1,974us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash used in financing activities (41,799)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (13,116)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate fluctuations on cash (1,039)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (484)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents 7,565us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (17,232)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 81,712us-gaap_CashAndCashEquivalentsAtCarryingValue 82,686us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 89,277us-gaap_CashAndCashEquivalentsAtCarryingValue 65,454us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the period for-    
Interest 3,441us-gaap_InterestPaid 3,322us-gaap_InterestPaid
Income taxes $ 3,968us-gaap_IncomeTaxesPaid $ 3,755us-gaap_IncomeTaxesPaid