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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Statement [Abstract] |  |  |
Unrealized gain (loss) on investment, taxes | $ 68 | $ 247 | $ 43
Adjustment to pension benefit plans, taxes | $ 264 | $ (324) | $ 22

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