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Comprehensive Income (Loss) - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Amortization of defined benefit pension items        
Prior service cost     $ (47)  
Actuarial losses     788  
Total before tax     741  
Tax benefit     (193)  
Net of tax $ 183 $ 142 $ 548 $ 424