Fair Value and Equity Investments, Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Fair Value and Equity Investments [Abstract]
Term of variable rate	30 days
Contingent Consideration [Member]
Changes in Fair Value of Level 3 Contingent Consideration [Roll Forward]
Beginning balance	$ (10,341)	$ (3,125)
Additions from acquisitions	0	0
Changes in fair value of contingent consideration	115	(139)
Ending balance	(10,226)	(3,264)
Fair Value on a Recurring Basis [Member]
Financial Assets (Liabilities) [Abstract]
Cash equivalents and current investments	57,647		$ 66,477
Derivative financial instruments asset	14,664		6,590
Life insurance contracts	46,450		49,851
Contingent consideration	(10,226)		(10,341)
Financial assets (liabilities)	108,535		112,577
Fair Value on a Recurring Basis [Member] | Level 1 [Member]
Financial Assets (Liabilities) [Abstract]
Cash equivalents and current investments	57,647		66,477
Derivative financial instruments asset	0		0
Life insurance contracts	0		0
Contingent consideration	0		0
Financial assets (liabilities)	57,647		66,477
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	14,664		6,590
Life insurance contracts	0		0
Contingent consideration	0		0
Financial assets (liabilities)	14,664		6,590
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	46,450		49,851
Contingent consideration	(10,226)		(10,341)
Financial assets (liabilities)	36,224		$ 39,510
Life Insurance Contracts [Member]
Changes in Fair Value of Level 3 Marketable Securities [Roll Forward]
Beginning balance	49,851	45,453
Actual return on plan assets	(3,401)	1,153
Purchase and issuances	0	7,016
Sales and settlements	0	(7,016)
Transfers into Level 3	0	0
Ending balance	$ 46,450	$ 46,606