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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables) | 12 Months Ended
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Dec. 31, 2020
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 January 1, 2018, net of tax |  | $ | (258 | ) |  | $ | (11,169 | ) |  | $ | (37 | ) |  | $ | (11,464 | ) |  |
Other comprehensive gain (loss) before reclassification |  |  | 268 |  |  |  | (6,690 | ) |  |  | (9 | ) |  |  | (6,431 | ) |  |
Reclassification to net income (1) |  |  | — |  |  |  | 1,661 |  |  |  | — |  |  |  | 1,661 |  |  | Selling, general and administrative, research and development and cost of sales
Change during period |  |  | 268 |  |  |  | (5,029 | ) |  |  | (9 | ) |  |  | (4,770 | ) |  |
Balance December 31, 2018, net of tax |  |  | 10 |  |  |  | (16,198 | ) |  |  | (46 | ) |  |  | (16,234 | ) |  |
Other comprehensive gain (loss) before reclassification |  |  | 181 |  |  |  | (3,492 | ) |  |  | — |  |  |  | (3,311 | ) |  |
Reclassification to net income (1) |  |  | — |  |  |  | 2,523 |  |  |  | 25 |  |  |  | 2,548 |  |  | Selling, general and administrative, research and development and cost of sales
Change during period |  |  | 181 |  |  |  | (969 | ) |  |  | 25 |  |  |  | (763 | ) |  |
Balance December 31, 2019, net of tax |  |  | 191 |  |  |  | (17,167 | ) |  |  | (21 | ) |  |  | (16,997 | ) |  |
Other comprehensive loss before reclassification |  |  | (100 | ) |  |  | (21,464 | ) |  |  | (14 | ) |  |  | (21,578 | ) |  |
Reclassification to net income (1) |  |  | — |  |  |  | 2,556 |  |  |  | — |  |  |  | 2,556 |  |  | Selling, general and administrative, research and development and cost of sales
Change during period |  |  | (100 | ) |  |  | (18,908 | ) |  |  | (14 | ) |  |  | (19,022 | ) |  |
Balance December 31, 2020, net of tax |  | $ | 91 |  |  | $ | (36,075 | ) |  | $ | (35 | ) |  | $ | (36,019 | ) |  |
(1) | The Company reclassified amortization of prior service cost, actuarial loss and plan amendment cost for its retirement plan from accumulated other comprehensive loss to net income of $2.6 million, $2.5 million and $1.7 million for the years ended December 31, 2020, 2019 and 2018, respectively.
(2) | Refer to Note 15: Employee Retirement Plans

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