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Pension Plans - Qualified Plan - Net Settlement Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plan [Member] | Qualified Plan [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment [Abstract]      
Net settlement loss $ 1,379 $ 1,740 $ 1,904