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 |