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Accumulated Other Comprehensive (Loss) Income (Tables) | 12 Months Ended
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Dec. 31, 2018
Changes in Accumulated Other Comprehensive (Loss) Income | Changes in accumulated other comprehensive (loss) income, which is 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) |
Balance at December 31, 2016, net of tax of $0, $209, $(778) |  | $ | (21,921 | ) |  | $ | (60 | ) |  | $ | 1,767 |  |  | $ | (20,214 | )
Other comprehensive income before reclassifications, net of tax of $0, $1,903, $0 |  |  | 37,840 |  |  |  | 1,863 |  |  |  | — |  |  |  | 39,703 |
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(297), $(154) |  |  | — |  |  |  | (441 | ) |  |  | (272 | ) |  |  | (713 | )
Net current period other comprehensive income, net of tax of $0, $1,606, $(154) |  |  | 37,840 |  |  |  | 1,422 |  |  |  | (272 | ) |  |  | 38,990 |
Balance at December 31, 2017, net of tax of $0, $1,815, $(932) |  |  | 15,919 |  |  |  | 1,362 |  |  |  | 1,495 |  |  |  | 18,776 |
Other comprehensive loss before reclassifications, net of tax of $0, $(722), $0 |  |  | (28,442 | ) |  |  | (2,110 | ) |  |  | — |  |  |  | (30,552 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(21), $(71) |  |  | — |  |  |  | 1,337 |  |  |  | (245 | ) |  |  | 1,092 |
Net current period other comprehensive loss, net of tax of $0, $(743), $(71) |  |  | (28,442 | ) |  |  | (773 | ) |  |  | (245 | ) |  |  | (29,460 | )
Reclassification of tax effects resulting 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 at December 31, 2018, net of tax of $0, $(521), $(1,081) |  | $ | (12,523 | ) |  | $ | (1,845 | ) |  | $ | 1,328 |  |  | $ | (13,040 | )
(a) | In the year ended December 31, 2018, Teradyne early adopted 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 year ended December 31, 2018, Teradyne adopted ASU 2016-01, “ Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities .” See Note B: “Accounting Policies.”
Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations | Reclassifications out of accumulated other comprehensive income to the statements of operations for the years ended December 31, 2018, 2017, and 2016 were as follows:
Details about Accumulated Other Comprehensive Income Components |  | For the year ended |  |  | Affected Line Item in the Statements of Operations |
|  | December 31, 2018 |  |  | December 31, 2017 |  |  | December 31, 2016 |  |  |  |
|  | (in thousands) |  |  |  |
Available-for-sale marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized (losses) gains, net of tax of $21, $297, $255 |  | $ | (1,337 | ) |  | $ | 441 |  |  | $ | 683 |  |  |  | Interest income (expense) |
Defined benefit pension and postretirement plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service benefit, net of tax of $71, $154, $190 |  |  | 245 |  |  |  | 272 |  |  |  | 321 |  |  |  | (a) |
Total reclassifications, net of tax of $92, $451, $445 |  | $ | (1,092 | ) |  | $ | 713 |  |  | $ | 1,004 |  |  |  | Net income |
(a) | The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note N: “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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