Employee Benefit Plans Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Retirement plan and pension plan, total	$ 10,513	$ 11,460	$ 11,917
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Pension Plan	(505)	(495)	(502)
Other Postretirement Benefit Plan | 401k Plan
Defined Benefit Plan Disclosure [Line Items]
401(k) Retirement Plan	$ 9,853	8,976	8,482
Maximum percentage of eligible employee’s covered compensation	5.00%
Percentage of plan vested	100.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pension Plan	$ 660	$ 2,484	$ 3,435