Benefit Plan Schedule of plan assets and benefit obligation activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined Benefit Plan, Plan Assets, Amount	$ 232,894	$ 209,138	$ 263,473
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	34,764	(37,319)
Defined Benefit Plan, Plan Assets, Benefits Paid	11,008	17,016
Defined Benefit Plan, Benefit Obligation	139,217	127,394	182,964
Defined Benefit Plan, Service Cost	6,236	9,749	9,916
Defined Benefit Plan, Interest Cost	6,523	5,705	$ 5,359
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	558
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	10,072	(54,566)
Benefits paid	11,008	17,016
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 93,677	$ 81,744