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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 110,268 $ 98,958
Other comprehensive income (loss):    
Reclassification adjustments for derivatives, net of tax 1,227 1,261
Pension and other postretirement adjustments, net of tax 1,262 1,413
Cumulative translation adjustment (3,281) 27,578
Other comprehensive income (loss) (792) 30,252
Comprehensive income $ 109,476 $ 129,210