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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Statement of Comprehensive Income [Abstract] |  |  |  |
Taxes on deferred gains (losses) on cash flow hedges | $ (319) | $ 1,049 | $ (1,506) | $ 1,745
Taxes on unrecognized retirement obligations | $ (57) | $ 53 | $ (144) | $ 156

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