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Consolidated Statements of Comprehensive Income Parenthetical - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Actuarial gain (loss), tax $ (1,176) $ 3,598 $ 1,792
Amortization of actuarial (gain) loss, tax (44) 380 651
Effects of settlements, tax $ 341 $ 5,902 $ 0