Employee Benefit Plans (Schedule of Defined Benefit Plan Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amounts recognized in the consolidated balance sheets:
Prepaid pension costs	$ 38,100	$ 44,585
Non-current employee benefit liabilities	(63,216)	(68,970)
Pension Benefits
Change in benefit obligation:
Benefit obligation at January 1	(121,166)	(125,842)
Service cost	(414)	(415)	$ (592)
Interest cost	(2,628)	(2,284)	(3,545)
Plan amendment	0	0
Benefits paid	5,993	6,452
Expenses paid	264	291
Actuarial gain	14,375	632
Benefit obligation at December 31	(103,576)	(121,166)	(125,842)
Change in plan assets:
Fair value of plan assets at January 1	104,545	102,812
Actual return on plan assets	(14,331)	8,373
Expenses paid	(264)	(291)
Contributions	101	103
Benefits paid	(5,993)	(6,452)
Fair value of plan assets at December 31	84,058	104,545	102,812
Unfunded status at December 31	(19,518)	(16,621)
Amounts recognized in the consolidated balance sheets:
Prepaid pension costs	38,100	44,585
Other accrued liabilities	(89)	(95)
Non-current employee benefit liabilities	(57,529)	(61,111)
Net amounts recognized	(19,518)	(16,621)
Other Postretirement Benefits
Change in benefit obligation:
Benefit obligation at January 1	(8,480)	(9,101)
Service cost	0	0	0
Interest cost	(233)	(224)	(286)
Plan amendment	0	(48)
Benefits paid	975	471
Expenses paid	0	0
Actuarial gain	1,455	422
Benefit obligation at December 31	(6,283)	(8,480)	(9,101)
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	975	471
Benefits paid	(975)	(471)
Fair value of plan assets at December 31	0	0	$ 0
Unfunded status at December 31	(6,283)	(8,480)
Amounts recognized in the consolidated balance sheets:
Prepaid pension costs	0	0
Other accrued liabilities	(596)	(621)
Non-current employee benefit liabilities	(5,687)	(7,859)
Net amounts recognized	$ (6,283)	$ (8,480)