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Consolidated Condensed Statements of Comprehensive Income (Loss) - 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] |  |  |  |
Net income | $ 2,751 | $ 16,659 | $ 11,165 | $ 29,625
Other comprehensive income (loss), gross of tax: |  |  |  |
Foreign currency translation adjustments gain (loss) | 3,477 | (22,994) | (597) | (11,244)
Unrealized gain (loss) on foreign currency derivative securities | 297 | (1,561) | 1,063 | 551
Unrealized loss on commodity derivative securities |  |  |  | (218)
Other comprehensive income (loss), gross of tax | 3,774 | (24,555) | 466 | (10,911)
Other comprehensive income (loss), related tax effect: |  |  |  |
Cumulative effect of accounting change due to ASU 2018-02 |  |  |  | (40)
Foreign currency translation adjustments gain (loss) | 3 | (156) | (174) | (232)
Unrealized gain (loss) on foreign currency derivative securities | (65) | 419 | (232) | (148)
Unrealized loss on commodity derivative securities |  |  |  | (68)
Other comprehensive income (loss), related tax effect | (62) | 263 | (406) | (488)
Other comprehensive (loss) income, net of tax | 3,712 | (24,292) | 60 | (11,399)
Comprehensive income (loss) | $ 6,463 | $ (7,633) | $ 11,225 | $ 18,226

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