Employee Benefit Plans (Summary of Net Periodic Benefit Cost) (Details) - Employee Pension Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Summary of net periodic benefit cost
Interest cost	$ 2,349	$ 3,032	$ 3,801
Service cost	935	925	900
Expected return on plan assets	(3,976)	(4,022)	(4,170)
Recognized net actuarial losses	2,860	2,407	1,933
Net periodic benefit cost	$ 2,168	$ 2,342	$ 2,464
Actuarial assumptions used to determine net cost:
Discount rate (as a percent)	2.24%	3.07%	4.12%
Expected return on assets (as a percent)	5.75%	5.75%	5.75%