Pensions - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Gain (loss) due to settlement (less than for three months ended September 30, 2023)	$ 100,000	$ (62,000)	$ 420,000	$ 328,000
Remeasurement gain (loss)	13,000	(3,466,000)	1,356,000	5,226,000
Qualified Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution costs	0	7,500,000	0	22,500,000
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	400,000	$ 400,000
Expected future employer contribution, current fiscal year	$ 800,000		$ 800,000