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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) | K. 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 Gain s (Losses) on Marketable Securities |  |  | Retirement Plans Prior Service Credit |  |  | Total |
|  | (in thousands) |
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 f rom 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 | )
Other comprehensive (loss) income before reclassifications, net of tax of $0, $1,659, $0 |  |  | (10,991 | ) |  |  | 6,015 |  |  |  | — |  |  |  | (4,976 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(192), $(43) |  |  | — |  |  |  | (690 | ) |  |  | (148 | ) |  |  | (838 | )
Net current period other comprehensive (loss) income, net of tax of $0, $1,467, $(43) |  |  | (10,991 | ) |  |  | 5,325 |  |  |  | (148 | ) |  |  | (5,814 | )
Balance at December 31, 2019, net of tax of $0, $946, $(1,124) |  | $ | (23,514 | ) |  | $ | 3,480 |  |  | $ | 1,180 |  |  | $ | (18,854 | )
(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 the statements of operations for the years ended December 31, 2019, 2018, and 2017, were as follows:
Details about Accumulated Other Comprehensive Income Components |  | For the year ended |  |  | Affected Line Item in the Statements of Operations |
|  | December 31, 2019 |  |  | December 31, 2018 |  |  | December 31, 2017 |  |  |  |
|  | (in thousands) |  |  |  |
Available-for-sale marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses), net of tax of $192, $21, $297 |  | $ | 690 |  |  | $ | (1,337 | ) |  | $ | 441 |  |  |  | Interest income (expense) |
Defined benefit pension and postretirement plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service benefit, net of tax of $43, $71, $154 |  |  | 148 |  |  |  | 245 |  |  |  | 272 |  |  |  | (a) |
Total reclassifications, net of tax of $235, $92, $451 |  | $ | 838 |  |  | $ | (1,092 | ) |  | $ | 713 |  |  |  | Net income |
(a) | The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note P: “Retirement Plans.”

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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