Benefit Plan Schedule of estimated future pension benefit payments (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Defined Benefit Plan [Abstract]
Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months	$ 9,676
Defined Benefit Plan Expected Future Benefit Payments Year Two	10,377
Defined Benefit Plan Expected Future Benefit Payments Year Three	11,038
Defined Benefit Plan Expected Future Benefit Payments Year Four	10,553
Defined Benefit Plan Expected Future Benefit Payments Year Five	11,627
Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter	58,398
Defined Benefit Plan, Expected Future Benefit Payments, Total	$ 111,669