Employee Benefit Plans (Schedule of Defined Benefit Plan Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amounts recognized in the consolidated balance sheets:
Prepaid pension costs	$ 45,292	$ 38,100
Non-current employee benefit liabilities	(67,111)	(63,216)
Pension Benefits
Change in benefit obligation:
Benefit obligation at January 1	(103,576)	(121,166)
Service cost	(397)	(414)	$ (415)
Interest cost	(5,090)	(2,628)	(2,284)
Benefits paid	5,634	5,993
Expenses paid	247	264
Actuarial gain	(807)	14,375
Benefit obligation at December 31	(103,989)	(103,576)	(121,166)
Change in plan assets:
Fair value of plan assets at January 1	84,058	104,545
Actual return on plan assets	9,279	(14,331)
Expenses paid	(247)	(264)
Contributions	100	101
Benefits paid	(5,634)	(5,993)
Fair value of plan assets at December 31	87,556	84,058	104,545
Unfunded status at December 31	(16,433)	(19,518)
Amounts recognized in the consolidated balance sheets:
Prepaid pension costs	45,292	38,100
Other accrued liabilities	(88)	(89)
Non-current employee benefit liabilities	(61,637)	(57,529)
Net amounts recognized	(16,433)	(19,518)
Other Postretirement Benefits
Change in benefit obligation:
Benefit obligation at January 1	(6,283)	(8,480)
Service cost	0	0	0
Interest cost	(323)	(233)	(224)
Benefits paid	960	975
Expenses paid	0	0
Actuarial gain	(429)	1,455
Benefit obligation at December 31	(6,075)	(6,283)	(8,480)
Change in plan assets:
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Expenses paid	0	0
Contributions	960	975
Benefits paid	(960)	(975)
Fair value of plan assets at December 31	0	0	$ 0
Unfunded status at December 31	(6,075)	(6,283)
Amounts recognized in the consolidated balance sheets:
Prepaid pension costs	0	0
Other accrued liabilities	(601)	(596)
Non-current employee benefit liabilities	(5,474)	(5,687)
Net amounts recognized	$ (6,075)	$ (6,283)