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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Taxes on deferred gains (losses) on cash flow hedges | $ 295 | $ 78 | $ 696 | $ (756)
Taxes on unrecognized retirement obligations | $ 52 | $ (1,241) | $ 103 | $ (1,386)

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