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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