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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables) | 6 Months Ended
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Jun. 30, 2021
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Loss | Amounts related to the changes in accumulated other comprehensive loss were as follows (in thousands):
|  | Unrealized Gain (Loss) on Available-for-Sale Securities |  |  | Net Unrealized Gain (Loss) on Retirement Plan (2) |  |  | Change in Cumulative Foreign Currency Translation Adjustment |  |  | Total |  |  | Affected Line Items in the Consolidated Statements of Income
Balance December 31, 2020, net of tax |  | $ | 91 |  |  | $ | (36,075 | ) |  | $ | (35 | ) |  | $ | (36,019 | ) |  |
Other comprehensive loss before reclassification |  |  | (32 | ) |  |  | — |  |  |  | (69 | ) |  |  | (101 | ) |  |
Reclassification to net income (1) |  |  | — |  |  |  | 2,348 |  |  |  | — |  |  |  | 2,348 |  |  | Selling, general and administrative, research and development and cost of sales
Change during period |  |  | (32 | ) |  |  | 2,348 |  |  |  | (69 | ) |  |  | 2,247 |  |  |
Balance June 30, 2021, net of tax |  | $ | 59 |  |  | $ | (33,727 | ) |  | $ | (104 | ) |  | $ | (33,772 | ) |  |
|  | Unrealized Gain (Loss) on Available-for-Sale Securities |  |  | Net Unrealized Gain (Loss) on Retirement Plan (2) |  |  | Change in Cumulative Foreign Currency Translation Adjustment |  |  | Total |  |  | Affected Line Items in the Consolidated Statements of Income
Balance December 31, 2019, net of tax |  | $ | 191 |  |  | $ | (17,167 | ) |  | $ | (21 | ) |  | $ | (16,997 | ) |  |
Other comprehensive gain before reclassification |  |  | 968 |  |  |  | — |  |  |  | (30 | ) |  |  | 938 |  |  |
Reclassification to net income (1) |  |  | — |  |  |  | 1,278 |  |  |  | — |  |  |  | 1,278 |  |  | Selling, general and administrative, research and development and cost of sales
Change during period |  |  | 968 |  |  |  | 1,278 |  |  |  | (30 | ) |  |  | 2,216 |  |  |
Balance June 30, 2020, net of tax |  | $ | 1,159 |  |  | $ | (15,889 | ) |  | $ | (51 | ) |  | $ | (14,781 | ) |  |
(1) | The Company reclassified amortization of prior service cost and actuarial loss for its retirement plan from accumulated other comprehensive loss to net income of $2.3 million and $1.3 million for the six months ended June 30, 2021 and 2020.
(2) | Refer to Note 14: Supplemental Executive Retirement Plan.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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