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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Taxes on deferred gains on cash flow hedges | $ 78 | $ (1,719) | $ (756) | $ (1,136)
Taxes on unrecognized retirement obligations | $ (1,241) | $ (965) | $ (1,386) | $ (1,942)

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