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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net income $ 58,481 $ 59,772 $ 171,931 $ 186,437
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 $(180) in third quarter 2018, $(296) in third quarter 2017, $(541) in nine months 2018 and $(888) in nine months 2017 (591) (475) (1,773) (1,423)
Actuarial net gain (loss) arising during the period, net of income tax expense (benefit) of $(51) in third quarter and nine months 2018 and $(841) in third quarter and nine months 2017 (163) (1,335) (163) (1,335)
Amortization of actuarial net loss (gain) included in net periodic benefit cost, net of income tax expense (benefit) of $318 in third quarter 2018, $487 in third quarter 2017, $1,037 in nine months 2018 and $1,563 in nine months 2017 1,003 845 3,270 2,692
Total pension plans and other postretirement benefits 249 (965) 1,334 (66)
Foreign currency translation adjustments, net of income tax expense (benefit) of $(109) in third quarter 2018, $712 in third quarter 2017, $(653) in nine months 2018 and $632 in nine months 2017 (3,760) 5,642 (3,793) 18,656
Other comprehensive income (loss) (3,511) 4,677 (2,459) 18,590
Comprehensive income $ 54,970 $ 64,449 $ 169,472 $ 205,027