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Accumulated Other Comprehensive (Loss) Income (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2019, net of tax of $0, $946, $(1,124), respectively |  | $ | (23,514 | ) |  | $ | 3,480 |  |  | $ | 1,180 |  |  | $ | (18,854 | )
Other comprehensive income before reclassifications, net of tax of $0, $1,629, $0, respectively |  |  | 48,903 |  |  |  | 5,839 |  |  |  | — |  |  |  | 54,742 |
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(665), $(2), respectively |  |  | — |  |  |  | (2,365 | ) |  |  | (7 | ) |  |  | (2,372 | )
Net current period other comprehensive income (loss), net of tax of $0, $964, $(2), respectively |  |  | 48,903 |  |  |  | 3,474 |  |  |  | (7 | ) |  |  | 52,370 |
Balance at December 31, 2020, net of tax of $0, $1,910, $(1,126), respectively |  | $ | 25,389 |  |  | $ | 6,954 |  |  | $ | 1,173 |  |  | $ | 33,516 |
Other comprehensive loss before reclassifications, net of tax of $0, $(578), $0, respectively |  |  | (36,207 | ) |  |  | (2,255 | ) |  |  | — |  |  |  | (38,462 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(277), $(2), respectively |  |  | — |  |  |  | (995 | ) |  |  | (7 | ) |  |  | (1,002 | )
Net current period other comprehensive loss, net of tax of $0, $(855), $(2), respectively |  |  | (36,207 | ) |  |  | (3,250 | ) |  |  | (7 | ) |  |  | (39,464 | )
Balance at December 31, 2021, net of tax of $0, $1,055, $(1,128), respectively |  | $ | (10,818 | ) |  | $ | 3,704 |  |  | $ | 1,166 |  |  | $ | (5,948 | )
Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations | Reclassifications out of accumulated other comprehensive (loss) inco m e to the statements of op e rations for the years ended December 31, 2021, 2020, and 2019, were as follows:
Details about Accumulated Other Comprehensive (Loss) Income Components |  | For the year s ended |  |  | Affected Line Item in the Statements of Operations |
|  | December 31, 2021 |  |  | December 31, 2020 |  |  | December 31, 2019 |  |  |  |
|  | (in thousands) |  |  |  |
Available-for-sale marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains, net of tax of $277, $665, $192, respectively |  | $ | 995 |  |  | $ | 2,365 |  |  | $ | 690 |  |  |  | Interest income |
Defined benefit pension and postretirement plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service benefit, net of tax of $2, $2, $43, respectively |  |  | 7 |  |  |  | 7 |  |  |  | 148 |  |  |  | (a) |
Total reclassifications, net of tax of $279, $667, $235, respectively |  | $ | 1,002 |  |  | $ | 2,372 |  |  | $ | 838 |  |  |  | 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=124509347&loc=d3e526-108580 + Details
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