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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 | $ 81,272 us-gaap_NetIncomeLoss | $ 164,947 us-gaap_NetIncomeLoss | $ 217,049 us-gaap_NetIncomeLoss
Adjustments to reconcile income from operations to net cash provided by operating activities: |  |  |
Depreciation | 73,390 us-gaap_Depreciation | 57,317 us-gaap_Depreciation | 55,049 us-gaap_Depreciation
Amortization | 79,154 us-gaap_AdjustmentForAmortization | 93,370 us-gaap_AdjustmentForAmortization | 90,465 us-gaap_AdjustmentForAmortization
Stock-based compensation | 40,307 us-gaap_ShareBasedCompensation | 36,612 us-gaap_ShareBasedCompensation | 39,920 us-gaap_ShareBasedCompensation
Goodwill impairment | 98,897 us-gaap_GoodwillImpairmentLoss |  |
Provision for excess and obsolete inventory | 22,193 us-gaap_InventoryWriteDown | 16,592 us-gaap_InventoryWriteDown | 26,849 us-gaap_InventoryWriteDown
Deferred taxes | (4,411)us-gaap_DeferredIncomeTaxExpenseBenefit | (4,284)us-gaap_DeferredIncomeTaxExpenseBenefit | 5,556 us-gaap_DeferredIncomeTaxExpenseBenefit
Gain from the sale of an equity investment |  | (34,212)us-gaap_GainLossOnSaleOfEquityInvestments |
Tax benefit related to stock options and restricted stock units | (535)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (2,675)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (8,490)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Non cash charge for the sale of inventories revalued at the date of acquisition |  |  | 6,089 us-gaap_OtherNoncashExpense
Retirement plans actuarial losses (gains) | 46,564 us-gaap_DefinedBenefitPlanActuarialGainLoss | (10,340)us-gaap_DefinedBenefitPlanActuarialGainLoss | 23,320 us-gaap_DefinedBenefitPlanActuarialGainLoss
Contingent consideration adjustment | (630)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 |  | (8,761)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Other | 3,505 us-gaap_OtherNoncashIncomeExpense | 1,107 us-gaap_OtherNoncashIncomeExpense | (2,250)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of businesses acquired: |  |  |
Accounts receivable | 8,060 us-gaap_IncreaseDecreaseInAccountsReceivable | (3,656)us-gaap_IncreaseDecreaseInAccountsReceivable | (24,093)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories | 51,172 us-gaap_IncreaseDecreaseInInventories | 21,170 us-gaap_IncreaseDecreaseInInventories | 17,652 us-gaap_IncreaseDecreaseInInventories
Prepayments and other assets | 41,537 ter_IncreaseDecreaseInPrepaidExpenseAndOtherAssets | (49,572)ter_IncreaseDecreaseInPrepaidExpenseAndOtherAssets | (2,995)ter_IncreaseDecreaseInPrepaidExpenseAndOtherAssets
Accounts payable and other accrued expenses | (45,430)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 15,205 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | (32,810)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue and customer advances | 22,033 us-gaap_IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits | (28,979)us-gaap_IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits | (14,627)us-gaap_IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits
Retirement plan contributions | (33,916)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations | (5,540)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations | (4,778)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
Accrued income taxes | 8,900 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 1,648 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 19,804 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Net cash provided by operating activities | 492,062 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 268,710 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 402,949 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment | (168,982)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (106,731)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (119,080)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of available-for-sale marketable securities | (1,578,743)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (1,170,506)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (748,229)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Acquisition of businesses, net of cash acquired | (19,419)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (14,999)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |
Proceeds from maturities of available-for-sale marketable securities | 570,358 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 516,499 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 225,085 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Proceeds from sales of available-for-sale marketable securities | 859,729 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 458,491 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 38,284 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from (purchases of) life insurance | 4,184 us-gaap_PaymentsForProceedsFromLifeInsurancePolicies | (307)us-gaap_PaymentsForProceedsFromLifeInsurancePolicies | 1,451 us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
Proceeds from the sale of an equity investment |  | 34,212 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |
Net cash used for investing activities | (332,873)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (283,341)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (602,489)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities: |  |  |
Issuance of common stock under stock option and stock purchase plans | 21,291 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions | 17,596 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions | 18,477 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Tax benefit related to stock options and restricted stock units | 535 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 2,675 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 8,490 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Dividend payments | (37,425)us-gaap_PaymentsOfDividends |  |
Payments of long-term debt | (190,972)us-gaap_RepaymentsOfLongTermDebt | (2,534)us-gaap_RepaymentsOfLongTermDebt | (2,533)us-gaap_RepaymentsOfLongTermDebt
Payments of contingent consideration |  | (388)ter_PaymentOfContingentConsiderationFinancing | (59,710)ter_PaymentOfContingentConsiderationFinancing
Net cash (used for) provided by financing activities | (206,571)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 17,349 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (35,276)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
(Decrease) increase in cash and cash equivalents | (47,382)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 2,718 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (234,816)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 341,638 us-gaap_CashAndCashEquivalentsAtCarryingValue | 338,920 us-gaap_CashAndCashEquivalentsAtCarryingValue | 573,736 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year | 294,256 us-gaap_CashAndCashEquivalentsAtCarryingValue | 341,638 us-gaap_CashAndCashEquivalentsAtCarryingValue | 338,920 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the year for: |  |  |
Interest | 4,294 us-gaap_InterestPaid | 8,590 us-gaap_InterestPaid | 8,602 us-gaap_InterestPaid
Income taxes | $ 25,893 us-gaap_IncomeTaxesPaidNet | $ 38,156 us-gaap_IncomeTaxesPaidNet | $ 8,084 us-gaap_IncomeTaxesPaidNet

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