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Consolidated Condensed Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 8,513 $ 18,446 $ 33,915 $ 30,339
Other comprehensive income (loss), gross of tax:        
Foreign currency translation adjustments gain (loss) 23,285 (7,274) 28,800 636
Unrealized gain (loss) on foreign currency derivative securities 815 (1,049) 3,775 244
Unrealized gain on commodity derivative securities 16 109 48 405
Other comprehensive income (loss), gross of tax 24,116 (8,214) 32,623 1,285
Other comprehensive income (loss), related tax effect:        
Foreign currency translation adjustments gain (loss) (106) (142) (109) 1,100
Unrealized gain (loss) on foreign currency derivative securities (219) 282 (1,014) (65)
Unrealized gain on commodity derivative securities (6) (41) (17) (150)
Other comprehensive income (loss), related tax effect (331) 99 (1,140) 885
Other comprehensive income (loss), net of tax 23,785 (8,115) 31,483 2,170
Comprehensive income $ 32,298 $ 10,331 $ 65,398 $ 32,509