Benefit Plan Schedule of plan assets and benefit obligation activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined Benefit Plan, Plan Assets, Amount	$ 263,473	$ 230,442	$ 210,623
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	48,138	27,800
Defined Benefit Plan, Plan Assets, Contributions by Employer	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	15,107	7,981
Defined Benefit Plan, Benefit Obligation	182,964	184,410	154,419
Defined Benefit Plan, Service Cost	9,916	8,319	5,873
Defined Benefit Plan, Interest Cost	5,359	5,283	5,491
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(1,614)	24,370
Benefits paid	15,107	7,981
Defined Benefit Plan, Funded (Unfunded) Status of Plan	80,509	46,032
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 1,764	$ 367	$ 1,141