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Accumulated Other Comprehensive (Loss) Income | 12 Months Ended
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Dec. 31, 2020
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 (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 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 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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