Benefit Plan Schedule of plan assets and benefit obligation activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined Benefit Plan, Plan Assets, Amount	$ 209,138	$ 263,473	$ 230,442
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(37,319)	48,138
Defined Benefit Plan, Plan Assets, Contributions by Employer	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	17,016	15,107
Defined Benefit Plan, Benefit Obligation	127,394	182,964	184,410
Defined Benefit Plan, Service Cost	9,749	9,916	8,319
Defined Benefit Plan, Interest Cost	5,705	5,359	5,283
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	558	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(54,566)	(1,614)
Benefits paid	17,016	15,107
Defined Benefit Plan, Funded (Unfunded) Status of Plan	81,744	80,509
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (2,359)	$ 1,764	$ 367