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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 31, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Products | $ 253,162 us-gaap_SalesRevenueGoodsNet | [1],[2],[3] | $ 402,987 us-gaap_SalesRevenueGoodsNet | [1],[4] | $ 452,488 us-gaap_SalesRevenueGoodsNet | [1] | $ 255,386 us-gaap_SalesRevenueGoodsNet | $ 211,710 us-gaap_SalesRevenueGoodsNet | [5],[6] | $ 365,825 us-gaap_SalesRevenueGoodsNet | $ 363,087 us-gaap_SalesRevenueGoodsNet | $ 214,300 us-gaap_SalesRevenueGoodsNet | $ 1,364,024 us-gaap_SalesRevenueGoodsNet |  | $ 1,154,922 us-gaap_SalesRevenueGoodsNet |  | $ 1,383,569 us-gaap_SalesRevenueGoodsNet |
Services | 70,074 us-gaap_SalesRevenueServicesNet | [1],[2],[3] | 75,023 us-gaap_SalesRevenueServicesNet | [1],[4] | 73,079 us-gaap_SalesRevenueServicesNet | [1] | 65,624 us-gaap_SalesRevenueServicesNet | 73,591 us-gaap_SalesRevenueServicesNet | [5],[6] | 67,551 us-gaap_SalesRevenueServicesNet | 65,802 us-gaap_SalesRevenueServicesNet | 66,067 us-gaap_SalesRevenueServicesNet | 283,800 us-gaap_SalesRevenueServicesNet |  | 273,011 us-gaap_SalesRevenueServicesNet |  | 273,181 us-gaap_SalesRevenueServicesNet |
Total revenues | 323,236 us-gaap_Revenues | [1],[2],[3] | 478,010 us-gaap_Revenues | [1],[4] | 525,567 us-gaap_Revenues | [1] | 321,010 us-gaap_Revenues | 285,301 us-gaap_Revenues | [5],[6] | 433,376 us-gaap_Revenues | 428,889 us-gaap_Revenues | 280,367 us-gaap_Revenues | 1,647,824 us-gaap_Revenues | [7] | 1,427,933 us-gaap_Revenues | [7] | 1,656,750 us-gaap_Revenues | [7]
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products | 131,337 us-gaap_CostOfGoodsSold | [1],[2],[3] | 182,591 us-gaap_CostOfGoodsSold | [1],[4] | 202,411 us-gaap_CostOfGoodsSold | [1] | 124,448 us-gaap_CostOfGoodsSold | 93,461 us-gaap_CostOfGoodsSold | [5],[6] | 150,365 us-gaap_CostOfGoodsSold | 158,411 us-gaap_CostOfGoodsSold | 96,793 us-gaap_CostOfGoodsSold | 640,787 us-gaap_CostOfGoodsSold |  | 499,030 us-gaap_CostOfGoodsSold |  | 642,881 us-gaap_CostOfGoodsSold |
Cost of services | 31,673 us-gaap_CostOfServices | [1],[2],[3] | 34,298 us-gaap_CostOfServices | [1],[4] | 32,743 us-gaap_CostOfServices | [1] | 29,515 us-gaap_CostOfServices | 31,983 us-gaap_CostOfServices | [5],[6] | 28,717 us-gaap_CostOfServices | 29,245 us-gaap_CostOfServices | 30,157 us-gaap_CostOfServices | 128,229 us-gaap_CostOfServices |  | 120,102 us-gaap_CostOfServices |  | 127,832 us-gaap_CostOfServices |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) | 163,010 us-gaap_CostOfRevenue | [1],[2],[3] | 216,889 us-gaap_CostOfRevenue | [1],[4] | 235,154 us-gaap_CostOfRevenue | [1] | 153,963 us-gaap_CostOfRevenue | 125,444 us-gaap_CostOfRevenue | [5],[6] | 179,082 us-gaap_CostOfRevenue | 187,656 us-gaap_CostOfRevenue | 126,950 us-gaap_CostOfRevenue | 769,016 us-gaap_CostOfRevenue |  | 619,132 us-gaap_CostOfRevenue |  | 770,713 us-gaap_CostOfRevenue |
Gross profit | 160,226 us-gaap_GrossProfit | [1],[2],[3] | 261,121 us-gaap_GrossProfit | [1],[4] | 290,413 us-gaap_GrossProfit | [1] | 167,047 us-gaap_GrossProfit | 159,857 us-gaap_GrossProfit | [5],[6] | 254,294 us-gaap_GrossProfit | 241,233 us-gaap_GrossProfit | 153,417 us-gaap_GrossProfit | 878,808 us-gaap_GrossProfit |  | 808,801 us-gaap_GrossProfit |  | 886,037 us-gaap_GrossProfit |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Engineering and development | 79,188 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | [1],[2],[3] | 71,953 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | [1],[4] | 73,414 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | [1] | 67,085 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | 64,613 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | [5],[6] | 68,918 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | 67,773 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | 62,751 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | 291,639 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost |  | 264,055 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost |  | 255,866 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost |
Selling and administrative | 91,157 us-gaap_SellingGeneralAndAdministrativeExpense | [1],[2],[3] | 73,064 us-gaap_SellingGeneralAndAdministrativeExpense | [1],[4] | 77,489 us-gaap_SellingGeneralAndAdministrativeExpense | [1] | 78,003 us-gaap_SellingGeneralAndAdministrativeExpense | 69,523 us-gaap_SellingGeneralAndAdministrativeExpense | [5],[6] | 72,917 us-gaap_SellingGeneralAndAdministrativeExpense | 69,230 us-gaap_SellingGeneralAndAdministrativeExpense | 67,890 us-gaap_SellingGeneralAndAdministrativeExpense | 319,713 us-gaap_SellingGeneralAndAdministrativeExpense |  | 279,560 us-gaap_SellingGeneralAndAdministrativeExpense |  | 277,016 us-gaap_SellingGeneralAndAdministrativeExpense |
Goodwill impairment | 98,897 us-gaap_GoodwillImpairmentLoss | [1],[2],[3] |  |  |  |  |  |  |  |  |  |  | 98,897 us-gaap_GoodwillImpairmentLoss |  |  |  |  |
Acquired intangible assets amortization | 15,957 us-gaap_AmortizationOfIntangibleAssets | [1],[2],[3] | 18,271 us-gaap_AmortizationOfIntangibleAssets | [1],[4] | 18,271 us-gaap_AmortizationOfIntangibleAssets | [1] | 18,271 us-gaap_AmortizationOfIntangibleAssets | 18,284 us-gaap_AmortizationOfIntangibleAssets | [5],[6] | 18,064 us-gaap_AmortizationOfIntangibleAssets | 18,063 us-gaap_AmortizationOfIntangibleAssets | 18,036 us-gaap_AmortizationOfIntangibleAssets | 70,771 us-gaap_AmortizationOfIntangibleAssets |  | 72,447 us-gaap_AmortizationOfIntangibleAssets |  | 73,508 us-gaap_AmortizationOfIntangibleAssets |
Restructuring and other | 1,198 us-gaap_RestructuringSettlementAndImpairmentProvisions | [1],[2],[3] | (405)us-gaap_RestructuringSettlementAndImpairmentProvisions | [1],[4] | 572 us-gaap_RestructuringSettlementAndImpairmentProvisions | [1] |  | 600 us-gaap_RestructuringSettlementAndImpairmentProvisions | [5],[6] | 889 us-gaap_RestructuringSettlementAndImpairmentProvisions | 259 us-gaap_RestructuringSettlementAndImpairmentProvisions | 332 us-gaap_RestructuringSettlementAndImpairmentProvisions | 1,365 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 2,080 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | (7,721)us-gaap_RestructuringSettlementAndImpairmentProvisions |
Total operating expenses | 286,397 us-gaap_OperatingExpenses | [1],[2],[3] | 162,883 us-gaap_OperatingExpenses | [1],[4] | 169,746 us-gaap_OperatingExpenses | [1] | 163,359 us-gaap_OperatingExpenses | 153,020 us-gaap_OperatingExpenses | [5],[6] | 160,788 us-gaap_OperatingExpenses | 155,325 us-gaap_OperatingExpenses | 149,009 us-gaap_OperatingExpenses | 782,385 us-gaap_OperatingExpenses |  | 618,142 us-gaap_OperatingExpenses |  | 598,669 us-gaap_OperatingExpenses |
Income from operations | (126,171)us-gaap_OperatingIncomeLoss | [1],[2],[3] | 98,238 us-gaap_OperatingIncomeLoss | [1],[4] | 120,667 us-gaap_OperatingIncomeLoss | [1] | 3,688 us-gaap_OperatingIncomeLoss | 6,837 us-gaap_OperatingIncomeLoss | [5],[6] | 93,506 us-gaap_OperatingIncomeLoss | 85,908 us-gaap_OperatingIncomeLoss | 4,408 us-gaap_OperatingIncomeLoss | 96,423 us-gaap_OperatingIncomeLoss |  | 190,659 us-gaap_OperatingIncomeLoss |  | 287,368 us-gaap_OperatingIncomeLoss |
Non-operating (income) expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | (2,035)us-gaap_InvestmentIncomeInterest | [1],[2],[3] | (1,922)us-gaap_InvestmentIncomeInterest | [1],[4] | (1,266)us-gaap_InvestmentIncomeInterest | [1] | (1,036)us-gaap_InvestmentIncomeInterest | (1,206)us-gaap_InvestmentIncomeInterest | [5],[6] | (948)us-gaap_InvestmentIncomeInterest | (903)us-gaap_InvestmentIncomeInterest | (1,072)us-gaap_InvestmentIncomeInterest | (6,259)us-gaap_InvestmentIncomeInterest |  | (4,129)us-gaap_InvestmentIncomeInterest |  | (4,090)us-gaap_InvestmentIncomeInterest |
Interest expense | 214 us-gaap_InterestExpense | [1],[2],[3] | 144 us-gaap_InterestExpense | [1],[4] | 159 us-gaap_InterestExpense | [1] | 6,417 us-gaap_InterestExpense | 6,771 us-gaap_InterestExpense | [5],[6] | 6,488 us-gaap_InterestExpense | 6,435 us-gaap_InterestExpense | 6,403 us-gaap_InterestExpense | 6,934 us-gaap_InterestExpense |  | 26,097 us-gaap_InterestExpense |  | 24,534 us-gaap_InterestExpense |
Other (income) expense, net | 463 us-gaap_OtherNonoperatingIncomeExpense | [1],[2],[3] | (654)us-gaap_OtherNonoperatingIncomeExpense | [1],[4] | 382 us-gaap_OtherNonoperatingIncomeExpense | [1] | 180 us-gaap_OtherNonoperatingIncomeExpense | (34,168)us-gaap_OtherNonoperatingIncomeExpense | [5],[6] | 414 us-gaap_OtherNonoperatingIncomeExpense | 19 us-gaap_OtherNonoperatingIncomeExpense | 503 us-gaap_OtherNonoperatingIncomeExpense | 372 us-gaap_OtherNonoperatingIncomeExpense |  | (33,231)us-gaap_OtherNonoperatingIncomeExpense |  | 948 us-gaap_OtherNonoperatingIncomeExpense |
Income (loss) before income taxes | (124,813)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [1],[2],[3] | 100,670 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [1],[4] | 121,392 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [1] | (1,873)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 35,439 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [5],[6] | 87,552 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 80,357 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (1,426)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 95,376 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [8],[9] | 201,922 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [8],[9] | 265,976 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [8],[9]
Provision for income taxes | (21,002)us-gaap_IncomeTaxExpenseBenefit | [1],[2],[3] | 17,721 us-gaap_IncomeTaxExpenseBenefit | [1],[4] | 20,187 us-gaap_IncomeTaxExpenseBenefit | [1] | (2,802)us-gaap_IncomeTaxExpenseBenefit | 13,096 us-gaap_IncomeTaxExpenseBenefit | [5],[6] | 18,093 us-gaap_IncomeTaxExpenseBenefit | 13,801 us-gaap_IncomeTaxExpenseBenefit | (8,015)us-gaap_IncomeTaxExpenseBenefit | 14,104 us-gaap_IncomeTaxExpenseBenefit |  | 36,975 us-gaap_IncomeTaxExpenseBenefit |  | 48,927 us-gaap_IncomeTaxExpenseBenefit |
Net income | $ (103,811)us-gaap_NetIncomeLoss | [1],[2],[3] | $ 82,949 us-gaap_NetIncomeLoss | [1],[4] | $ 101,205 us-gaap_NetIncomeLoss | [1] | $ 929 us-gaap_NetIncomeLoss | $ 22,343 us-gaap_NetIncomeLoss | [5],[6] | $ 69,459 us-gaap_NetIncomeLoss | $ 66,556 us-gaap_NetIncomeLoss | $ 6,589 us-gaap_NetIncomeLoss | $ 81,272 us-gaap_NetIncomeLoss |  | $ 164,947 us-gaap_NetIncomeLoss |  | $ 217,049 us-gaap_NetIncomeLoss |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ (0.48)us-gaap_EarningsPerShareBasic | [1],[2],[3] | $ 0.40 us-gaap_EarningsPerShareBasic | [1],[4] | $ 0.52 us-gaap_EarningsPerShareBasic | [1] | $ 0.00 us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic | [5],[6] | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.35 us-gaap_EarningsPerShareBasic | $ 0.03 us-gaap_EarningsPerShareBasic | $ 0.40 us-gaap_EarningsPerShareBasic |  | $ 0.86 us-gaap_EarningsPerShareBasic |  | $ 1.16 us-gaap_EarningsPerShareBasic |
Diluted | $ (0.48)us-gaap_EarningsPerShareDiluted | [1],[2],[3] | $ 0.38 us-gaap_EarningsPerShareDiluted | [1],[4] | $ 0.47 us-gaap_EarningsPerShareDiluted | [1] | $ 0.00 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | [5],[6] | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.03 us-gaap_EarningsPerShareDiluted | $ 0.37 us-gaap_EarningsPerShareDiluted |  | $ 0.70 us-gaap_EarningsPerShareDiluted |  | $ 0.94 us-gaap_EarningsPerShareDiluted |
Weighted average common shares-basic |  |  |  |  |  |  |  |  |  |  |  |  | 202,908 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 190,772 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 186,878 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Weighted average common shares-diluted |  |  |  |  |  |  |  |  |  |  |  |  | 222,550 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 235,599 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 230,246 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Cash dividend declared per common share | $ 0.06 us-gaap_CommonStockDividendsPerShareDeclared | [1],[2],[3] | $ 0.06 us-gaap_CommonStockDividendsPerShareDeclared | [1],[4] | $ 0.06 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.00 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0 us-gaap_CommonStockDividendsPerShareDeclared | [5],[6] | $ 0.0 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.18 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |  |
[1] | Dividends declared by Teradyne's Board of Directors were paid in each of the second, third and fourth quarters of 2014.
[2] | In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[3] | In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[4] | Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] | Other (income) expense, net includes a $34.2 million gain from the sale of an equity investment.
[6] | In the fourth quarter ended December 31, 2013, Teradyne recorded pension and post retirement net actuarial gains of $9.0 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[7] | Revenues attributable to a country are based on location of customer site.
[8] | Interest income, interest expense, other (income) expense, net and pension and postretirement plans actuarial gains and losses are included in Corporate and Eliminations.
[9] | Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and goodwill impairment charges.

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