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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 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) |
Six Months Ended June 30, 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, $1,256, $0, respectively |  |  | 983 |  |  |  | 4,637 |  |  |  | — |  |  |  | 5,620 |
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(26), $(21), respectively |  |  | — |  |  |  | (97 | ) |  |  | (74 | ) |  |  | (171 | )
Net current period other comprehensive income (loss), net of tax of $0, $1,230, $(21), respectively |  |  | 983 |  |  |  | 4,540 |  |  |  | (74 | ) |  |  | 5,449 |
Balance at June 30, 2019, net of tax of $0, $709, $(1,102), respectively |  | $ | (11,540 | ) |  | $ | 2,695 |  |  | $ | 1,254 |  |  | $ | (7,591 | )
|  | Foreign Currency Translation Adjustments |  |  | Unrealized Gains (Losses) on Marketable Securities |  |  | Retirement Plans Prior Service Credit |  |  | Total |
|  | (in thousands) |
Six Months Ended July 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, $(774), $0, respectively |  |  | (18,781 | ) |  |  | (2,489 | ) |  |  | — |  |  |  | (21,270 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $11, $(35), respectively |  |  | — |  |  |  | 1,469 |  |  |  | (123 | ) |  |  | 1,346 |
Net current period other comprehensive income (loss), net of tax of $0, $(733), $(35), respectively |  |  | (18,781 | ) |  |  | (1,020 | ) |  |  | (123 | ) |  |  | (19,924 | )
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 July 1, 2018, net of tax of $0, $(511), $(1,045), respectively |  | $ | (2,862 | ) |  | $ | (2,092 | ) |  | $ | 1,450 |  |  | $ | (3,504 | )
(a) | In the six months ended July 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 six months ended July 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 and six months ended June 30, 2019 and July 1, 2018 were as follows:
Details about Accumulated Other Comprehensive Income Components |  | For the Three Months Ended |  |  | For the Six Months Ended |  |  | Affected Line Item in the Statements of Operations |  |
|  | June 30, 2019 |  |  | July 1, 2018 |  |  | June 30, 2019 |  |  | July 1, 2018 |  |  |  |
|  | (in thousands) |  |  |  |  |
Available-for-sale marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses), net of tax of $6, $68, $26, $(11), respectively |  | $ | 27 |  |  | $ | 199 |  |  | $ | 97 |  |  | $ | (1,469 | ) |  |  | Interest income (expense) |
Defined benefit pension and postretirement plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service benefit, net of tax of $11, $18, $21, $35 respectively |  |  | 37 |  |  |  | 61 |  |  |  | 74 |  |  |  | 123 |  |  |  | (a) |
Total reclassifications, net of tax of $17, $86, $47, $24, respectively |  | $ | 64 |  |  | $ | 260 |  |  | $ | 171 |  |  | $ | (1,346 | ) |  |  | 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 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=118930883&loc=d3e526-108580 + Details
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