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Consolidated Statements Of Comprehensive Income (Parenthetical) - 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]        
Amortization of prior service cost (credit) included in net periodic benefit cost, income tax expense (benefit) $ (180) $ (296) $ (541) $ (888)
Actuarial net gain (loss) arising during the period, income tax expense (benefit) (51) (841) (51) (841)
Amortization of actuarial net loss (gain) included in net periodic benefit cost, income tax expense (benefit) 318 487 1,037 1,563
Foreign currency translation adjustments, income tax expense (benefit) $ (109) $ 712 $ (653) $ 632