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Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Adjustment for pension and postretirement benefit liability, tax | $ 20 | $ 20 | $ 60 | $ 60
Adjustment for interest rate swap, tax | $ (221) | $ (194) | $ (755) | 1,101
ASU 2016-13 |  |  |  |
Retained Earnings Tax |  |  |  | $ 193

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