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Consolidated Statements of Comprehensive Income (Unaudited) Parentheticals - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Amortization of actuarial (gain) loss, tax $ (1) $ 51
Effect of settlements, tax effect $ 0 $ 22