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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income | Retained Earnings
--- | --- | --- | --- | --- | ---
Balance, at Dec. 31, 2011 | $ 1,505,060 us-gaap_StockholdersEquity |  | $ 22,948 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,293,130 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 4,746 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 184,236 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Balance, Shares at Dec. 31, 2011 |  |  | 183,587 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  |  | 4,321 ter_SharesOfStockIssuedDuringPeriodShareBasedCompensationNetOfSharesWithheldForTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 6,894 ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes |  | 540 ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,354 ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stock-based compensation expense | 39,920 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  | 39,920 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Tax benefit related to stock options and restricted stock units | 8,358 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  | 8,358 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Net income | 217,049 us-gaap_NetIncomeLoss |  |  |  |  | 217,049 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Unrealized loss (gain) on marketable securities: |  |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax of $370 in 2012, $216 in 2013 and $1,449 in 2014 | 2,009 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  | 2,009 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Less: reclassification adjustment for gains included in net income, net of tax of $(201) in 2012, $(257) in 2013 and $(645) in 2014 | (702)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax |  |  |  | (702)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Amortization of prior service benefit, net of tax of $(134) in 2012, $(159) in 2013 and $(169)in 2014 | (233)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | [1] |  |  | (233)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Balance, at Dec. 31, 2012 | 1,778,355 us-gaap_StockholdersEquity |  | 23,488 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,347,762 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 5,820 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 401,285 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Balance, Shares at Dec. 31, 2012 |  |  | 187,908 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  |  | 3,823 ter_SharesOfStockIssuedDuringPeriodShareBasedCompensationNetOfSharesWithheldForTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 5,404 ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes |  | 478 ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,926 ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stock-based compensation expense | 35,612 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  | 35,612 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Tax benefit related to stock options and restricted stock units | 2,596 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  | 2,596 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Net income | 164,947 us-gaap_NetIncomeLoss |  |  |  |  | 164,947 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Unrealized loss (gain) on marketable securities: |  |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax of $370 in 2012, $216 in 2013 and $1,449 in 2014 | (1,097)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  | (1,097)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Less: reclassification adjustment for gains included in net income, net of tax of $(201) in 2012, $(257) in 2013 and $(645) in 2014 | (447)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax |  |  |  | (447)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Amortization of prior service benefit, net of tax of $(134) in 2012, $(159) in 2013 and $(169)in 2014 | (276)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | [1] |  |  | (276)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Balance, at Dec. 31, 2013 | 1,985,094 us-gaap_StockholdersEquity |  | 23,966 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,390,896 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 4,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 566,232 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Balance, Shares at Dec. 31, 2013 |  |  | 191,731 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  |  | 3,661 ter_SharesOfStockIssuedDuringPeriodShareBasedCompensationNetOfSharesWithheldForTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 9,273 ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes |  | 458 ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 8,815 ter_StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Warrant settlement |  |  | 2,653 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (2,653)us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Warrant settlement Shares |  |  | 21,221 ter_AdjustmentsToAdditionalPaidInCapitalWarrantIssuedShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock-based compensation expense | 39,868 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  | 39,868 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Tax benefit related to stock options and restricted stock units | 209 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  | 209 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Cash dividends | (37,425)us-gaap_DividendsCash |  |  |  |  | (37,425)us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net income | 81,272 us-gaap_NetIncomeLoss |  |  |  |  | 81,272 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Unrealized loss (gain) on marketable securities: |  |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax of $370 in 2012, $216 in 2013 and $1,449 in 2014 | 2,417 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  | 2,417 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Less: reclassification adjustment for gains included in net income, net of tax of $(201) in 2012, $(257) in 2013 and $(645) in 2014 | (1,433)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax |  |  |  | (1,433)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Amortization of prior service benefit, net of tax of $(134) in 2012, $(159) in 2013 and $(169)in 2014 | (295)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | [1] |  |  | (295)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Balance, at Dec. 31, 2014 | $ 2,078,980 us-gaap_StockholdersEquity |  | $ 27,077 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,437,135 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 4,689 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 610,079 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Balance, Shares at Dec. 31, 2014 |  |  | 216,613 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
[1] | The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note M: "Retirement Plans."

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant