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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]    
Net income $ 61,931 $ 63,947
Pension plans and other postretirement benefits:    
Amortization of prior service cost (credit) included in net periodic benefit cost, net of income tax expense (benefit) of $(305) in 2016 and $4 in 2015 (489) (3)
Amortization of actuarial net loss (gain) included in net periodic benefit cost, net of income tax expense (benefit) of $570 in 2016 and $768 in 2015 991 1,360
Total pension plans and other postretirement benefits 502 1,357
Foreign currency translation adjustments, net of income tax expense (benefit) of $1,665 in 2016 and $(1,098) in 2015 (4,763) (25,664)
Other comprehensive income (loss) (4,261) (24,307)
Comprehensive income $ 57,670 $ 39,640