Benefit Plan Schedule of estimated future pension benefit payments (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months	$ 11,582
Defined Benefit Plan Expected Future Benefit Payments Year Two	11,798
Defined Benefit Plan Expected Future Benefit Payments Year Three	11,672
Defined Benefit Plan Expected Future Benefit Payments Year Four	12,613
Defined Benefit Plan Expected Future Benefit Payments Year Five	12,758
Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter	62,929
Defined Benefit Plan, Expected Future Benefit Payments, Total	$ 123,352