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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Net income | $ 37,506 | $ 41,899 | $ 35,227
Other comprehensive income (loss), gross of tax: |  |  |
Net (loss) gain on pension benefit obligations | (1,264) | 91 | 244
Foreign currency translation adjustments (loss) gain | (2,415) | (19,212) | 48,059
Unrealized gain on foreign currency derivative securities | 1,151 | 1,096 | 301
Unrealized (loss) gain on commodity derivative securities |  | (218) | 55
Other comprehensive (loss) gain, gross of tax | (2,528) | (18,243) | 48,659
Other comprehensive income (loss), related tax effect: |  |  |
Cumulative effect of accounting change due to ASU 2018-02 |  | (40) |
Net gain (loss) on pension benefit obligations | 232 | (15) | (60)
Foreign currency translation adjustments (loss) gain | (393) | (390) | 148
Unrealized loss on foreign currency derivative securities | (252) | (300) | (81)
Unrealized loss on commodity derivative securities |  | (68) | (19)
Other comprehensive loss, related tax effect | (413) | (813) | (12)
Other comprehensive loss, net of tax | (2,941) | (19,056) | 48,647
Comprehensive income | $ 34,565 | $ 22,843 | $ 83,874

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