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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Tax expense (benefit) on actuarial gain (loss), employee benefit plans $ 1,746 $ (2,215) $ 404 $ (2,476)
Tax expense, adjustment for items reclassified to earnings, employee benefit plans $ 468 $ 196 $ 684 $ 472