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Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net income | $ 18,446 | $ 19,494 | $ 30,339 | $ 39,314
Other comprehensive loss, gross of tax: |  |  |  |
Foreign currency translation adjustments gain (loss) | (7,274) | 4,722 | 636 | (14,883)
Unrealized gain (loss) on foreign currency derivative securities | (1,049) | (430) | 244 | (777)
Unrealized gain on commodity derivative securities | 109 | (124) | 405 | (48)
Other comprehensive income (loss), gross of tax | (8,214) | 4,168 | 1,285 | (15,708)
Other comprehensive income (loss), related tax effect: |  |  |  |
Foreign currency translation adjustments gain (loss) | (142) | 246 | 1,100 | 713
Unrealized gain (loss) on foreign currency derivative securities | 282 | 121 | (65) | 210
Unrealized gain on commodity derivative securities | (41) |  | (150) |
Other comprehensive income (loss), related tax effect | 99 | 367 | 885 | 923
Other comprehensive income (loss), net of tax | (8,115) | 4,535 | 2,170 | (14,785)
Comprehensive income | $ 10,331 | $ 24,029 | $ 32,509 | $ 24,529

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