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Consolidated Condensed Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 25,402 $ 11,893
Other comprehensive income, gross of tax:    
Foreign currency translation adjustments gain 5,515 7,910
Unrealized gain on foreign currency derivative securities 2,960 1,293
Unrealized gain on commodity derivative securities 32 296
Other comprehensive income, gross of tax 8,507 9,499
Other comprehensive income, related tax effect:    
Foreign currency translation adjustments gain (3) 1,242
Unrealized gain on foreign currency derivative securities (795) (347)
Unrealized gain on commodity derivative securities (11) (109)
Other comprehensive income, related tax effect (809) 786
Other comprehensive income, net of tax 7,698 10,285
Comprehensive income $ 33,100 $ 22,178