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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2019
Changes in Accumulated Other Comprehensive (Loss) Income | Changes in accumulated other comprehensive income (loss), which are presented net of tax, consist of the following:
|  | Foreign Currency Translation Adjustment |  |  | Unrealized Gains (Losses) on Marketable Securities |  |  | Retirement Plans Prior Service Credit |  |  | Total |
|  | (in thousands) |
Three Months Ended March 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2018, net of tax of $0, $(521), $(1,081), respectively |  | $ | (12,523 | ) |  | $ | (1,845 | ) |  | $ | 1,328 |  |  | $ | (13,040 | )
Other comprehensive income before reclassifications, net of tax of $0, $577, $0, respectively |  |  | (4,659 | ) |  |  | 2,100 |  |  |  | — |  |  |  | (2,559 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(20), $(11), respectively |  |  | — |  |  |  | (70 | ) |  |  | (37 | ) |  |  | (107 | )
Net current period other comprehensive income (loss), net of tax o f $0, $557, $(11), respectively |  |  | (4,659 | ) |  |  | 2,030 |  |  |  | (37 | ) |  |  | (2,666 | )
Balance at March 31, 2019, net of tax of $0, $36, $(1,092), respectively |  | $ | (17,182 | ) |  | $ | 185 |  |  | $ | 1,291 |  |  | $ | (15,706 | )
|  | Foreign Currency Translation Adjustments |  |  | Unrealized Gains (Losses) on Marketable Securities |  |  | Retirement Plans Prior Service Credit |  |  | Total |
|  | (in thousands) |
Three Months Ended April 1, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2017, net of tax of $0, $1,815, $(932), respectively |  | $ | 15,919 |  |  | $ | 1,362 |  |  | $ | 1,495 |  |  | $ | 18,776 |
Other comprehensive income (loss) before reclassifications, net of tax of $0, $(718), $0, respectively |  |  | 10,541 |  |  |  | (2,687 | ) |  |  | — |  |  |  | 7,854 |
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $78, $(18), respectively |  |  | — |  |  |  | 1,668 |  |  |  | (61 | ) |  |  | 1,607 |
Net current period other comprehensive income (loss), net of tax of $0, $(640), $(18), respectively |  |  | 10,541 |  |  |  | (1,019 | ) |  |  | (61 | ) |  |  | 9,461 |
Reclassification of income tax effects from the Tax Reform Act, net of tax of $0, $(691), $(78), respectively (a) |  |  | — |  |  |  | 691 |  |  |  | 78 |  |  |  | 769 |
Reclassification of unrealized gains on equity securities, net of tax of $0, $(902), $0, respectively (b) |  |  | — |  |  |  | (3,125 | ) |  |  | — |  |  |  | (3,125 | )
Balance as April 1, 2018, net of tax of $0, $(418), $(1,028), respectively |  | $ | 26,460 |  |  | $ | (2,091 | ) |  | $ | 1,512 |  |  | $ | 25,881 |
| (a) | In the three months ended April 1, 2018 , Teradyne early adopted the ASU 2018-02, “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” As a result, the stranded tax effects resulting from the Tax Reform Act enacted in December 2017 were reclassified from accumulated other comprehensive income to retained earnings.
| (b) | In the three months ended April 1, 2018, Teradyne adopted the ASU 2016-01, “ Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities .”
Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations | Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three months ended March 31, 2019 and April 1, 2018 were as follows:
Details about Accumulated Other Comprehensive Income Components |  | For the Three Months Ended |  |  | Affected Line Item in the Statements of Operations
|  | March 31, 2019 |  |  | April 1, 2 018 |  |  |
|  | (in thousands) |  |  |
Available-for-sale marketable securities: |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses), net of tax of $ 20 , $( 78 ), respectively |  | $ | 70 |  |  | $ | (1,668 | ) |  |  | Interest (expense) income
Defined benefit pension and postretirement plans: |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service benefit, net of tax of $ 11 , $ 18 , respectively |  |  | 37 |  |  |  | 61 |  |  |  | (a)
Total reclassifications, net of tax of $ 31 , $( 60 ), respectively |  | $ | 107 |  |  | $ | (1,607 | ) |  |  | Net income
| (a) | The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit. See Note R: “Retirement Plans.”

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e526-108580 + Details
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