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Accumulated Other Comprehensive (Loss) Income (Tables) | 12 Months Ended
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Dec. 31, 2020
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 (Losses) Gains on Marketable Securities |  |  | Retirement Plans Prior Service Credit |  |  | Total |
|  | (in thousands) |
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 | )
Other comprehensive income before reclassifications, net of tax of $0, $1,629, $0 |  |  | 48,903 |  |  |  | 5,839 |  |  |  | — |  |  |  | 54,742 |
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(665), $(2) |  |  | — |  |  |  | (2,365 | ) |  |  | (7 | ) |  |  | (2,372 | )
Net current period other comprehensive income (loss), net of tax of $0, $964, $(2) |  |  | 48,903 |  |  |  | 3,474 |  |  |  | (7 | ) |  |  | 52,370 |
Balance at December 31, 2020, net of tax of $0, $1,910, $(1,126) |  | $ | 25,389 |  |  | $ | 6,954 |  |  | $ | 1,173 |  |  | $ | 33,516 |
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, 2020, 2019, and 2018, were as follows:
Details about Accumulated Other Comprehensive Income Components |  | For the year ended |  |  | Affected Line Item in the Statements of Operations |
|  | December 31, 2020 |  |  | December 31, 2019 |  |  | December 31, 2018 |  |  |  |
|  | (in thousands) |  |  |  |
Available-for-sale marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses), net of tax of $665, $192, $21 |  | $ | 2,365 |  |  | $ | 690 |  |  | $ | (1,337 | ) |  |  | Interest income (expense) |
Defined benefit pension and postretirement plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service benefit, net of tax of $2, $43, $71 |  |  | 7 |  |  |  | 148 |  |  |  | 245 |  |  |  | (a) |
Total reclassifications, net of tax of $667, $235, $92 |  | $ | 2,372 |  |  | $ | 838 |  |  | $ | (1,092 | ) |  |  | 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 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=121641772&loc=d3e526-108580 + Details
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