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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Amortization of actuarial loss included in net periodic cost, tax expense $ 475 $ 588 $ 917 $ 1,205
Amortization of prior service credit included in net periodic cost, tax benefit $ 0 $ (111) $ 0 $ (221)