Fair Value and Equity Investments, Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Contingent Consideration [Member]
Changes in Fair Value of Level 3 Contingent Consideration [Roll Forward]
Beginning balance	$ (6,364)	$ (10,341)
Changes in fair value of contingent consideration	64	3,977
Ending balance	(6,300)	(6,364)
Fair Value on a Recurring Basis [Member]
Financial Assets (Liabilities) [Abstract]
Cash equivalents and current investments	42,916	55,356
Derivative financial instruments asset	12,689	19,738
Life insurance contracts	45,041	40,055
Contingent consideration	(6,300)	(6,364)
Financial assets (liabilities)	94,346	108,785
Restricted current investments	4,000	4,900
Fair Value on a Recurring Basis [Member] | Level 1 [Member]
Financial Assets (Liabilities) [Abstract]
Cash equivalents and current investments	42,916	55,356
Derivative financial instruments asset	0	0
Life insurance contracts	0	0
Contingent consideration	0	0
Financial assets (liabilities)	42,916	55,356
Fair Value on a Recurring Basis [Member] | Level 2 [Member]
Financial Assets (Liabilities) [Abstract]
Cash equivalents and current investments	0	0
Derivative financial instruments asset	12,689	19,738
Life insurance contracts	0	0
Contingent consideration	0	0
Financial assets (liabilities)	12,689	19,738
Fair Value on a Recurring Basis [Member] | Level 3 [Member]
Financial Assets (Liabilities) [Abstract]
Cash equivalents and current investments	0	0
Derivative financial instruments asset	0	0
Life insurance contracts	45,041	40,055
Contingent consideration	(6,300)	(6,364)
Financial assets (liabilities)	38,741	33,691
Life Insurance Contracts [Member]
Changes in Fair Value of Level 3 Marketable Securities [Roll Forward]
Beginning balance	40,055	49,851
Actual return on plan assets	6,216	(9,180)
Sales and settlements	(1,230)	(616)
Ending balance	$ 45,041	$ 40,055