Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, cost recognized	$ 10,900	$ 11,100	$ 8,600
Salary continuation plan minimum period	10 years
Salary continuation plan maximum period	20 years
Present value of future salary contribution plan benefits	$ 27,800	28,900
Postemployment benefits, period expense	2,200	3,600	$ 1,500
Deferred compensation cash-based arrangements, liability, current and noncurrent	12,500	12,800
Cash surrender value of life insurance	327,700	323,500
Other postretirement defined benefit plan, liabilities	4,000	3,700
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other deferred compensation arrangements, liability, current and noncurrent	$ 577	559
Percentage of deferred salary	50.00%
Deferred compensation liability, current and noncurrent	$ 10,500	10,300
Pension and other postretirement defined benefit plans, liabilities	$ 8,700	$ 9,100