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Pensions - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Gain (loss) due to settlement $ 420,000 $ 390,000 $ 420,000 $ 390,000
Remeasurement gain (loss) 1,343,000 8,692,000 1,343,000 8,692,000
Qualified Plan | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Contribution costs 0 7,500,000 0 15,000,000
Expected future employer contribution, current fiscal year 0   0  
Nonqualified Plan | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Contribution costs 100,000 $ 100,000 300,000 $ 300,000
Expected future employer contribution, current fiscal year $ 500,000   $ 500,000