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Consolidated Statements of Comprehensive Income (Unaudited) Parentheticals - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Amortization of actuarial (gain) loss, tax $ (2) $ 51 $ (4) $ 153
Effect of settlements, tax effect $ 0 $ 0 $ 0 $ 22