Fair Value of Financial Instruments - Carrying Value (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Liabilities:
Contingent consideration	$ 57,371	$ 80,477
Recurring
Other noncurrent assets
Marketable securities - restricted (SERP)	464	630
Total assets at fair value	524,190	459,476
Liabilities:
Contingent consideration	57,371	80,477
Total liabilities at fair value	57,371	80,477
Recurring \| Corporate and Municipal Debt Securities
Marketable securities
Corporate and municipal debt securities	280,297	136,246
Long term marketable securities
Corporate and municipal debt securities	131,937	119,166
Recurring \| Cash
Cash and cash equivalents
Cash and Money market funds	111,087	148,863
Recurring \| Money market funds
Cash and cash equivalents
Cash and Money market funds	405	54,571
Recurring \| Level 1
Other noncurrent assets
Marketable securities - restricted (SERP)	9	7
Total assets at fair value	111,501	203,692
Liabilities:
Contingent consideration	0	0
Total liabilities at fair value	0	0
Recurring \| Level 1 \| Corporate and Municipal Debt Securities
Marketable securities
Corporate and municipal debt securities	0	251
Long term marketable securities
Corporate and municipal debt securities	0	0
Recurring \| Level 1 \| Cash
Cash and cash equivalents
Cash and Money market funds	111,087	148,863
Recurring \| Level 1 \| Money market funds
Cash and cash equivalents
Cash and Money market funds	405	54,571
Recurring \| Level 2
Other noncurrent assets
Marketable securities - restricted (SERP)	455	623
Total assets at fair value	412,689	255,784
Liabilities:
Contingent consideration	0	0
Total liabilities at fair value	0	0
Recurring \| Level 2 \| Corporate and Municipal Debt Securities
Marketable securities
Corporate and municipal debt securities	280,297	135,995
Long term marketable securities
Corporate and municipal debt securities	131,937	119,166
Recurring \| Level 2 \| Cash
Cash and cash equivalents
Cash and Money market funds	0	0
Recurring \| Level 2 \| Money market funds
Cash and cash equivalents
Cash and Money market funds	0	0
Recurring \| Level 3
Other noncurrent assets
Marketable securities - restricted (SERP)	0	0
Total assets at fair value	0	0
Liabilities:
Contingent consideration	57,371	80,477
Total liabilities at fair value	57,371	80,477
Recurring \| Level 3 \| Corporate and Municipal Debt Securities
Marketable securities
Corporate and municipal debt securities	0	0
Long term marketable securities
Corporate and municipal debt securities	0	0
Recurring \| Level 3 \| Cash
Cash and cash equivalents
Cash and Money market funds	0	0
Recurring \| Level 3 \| Money market funds
Cash and cash equivalents
Cash and Money market funds	$ 0	$ 0

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