Fair Value of Financial Measurements - Carrying Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Liabilities:
Contingent consideration	$ 53,654	$ 54,967
Recurring
Other assets
Marketable securities - restricted (SERP)	512	496
Total assets at fair value	225,826	555,726
Liabilities:
Contingent consideration	53,654	54,967
Total liabilities at fair value	53,654	54,967
Recurring \| Corporate and municipal debt securities
Marketable securities
Corporate and municipal debt securities	105,204	368,214
Long-term marketable securities
Corporate and municipal debt securities	25,125	93,896
Recurring \| Cash
Cash and cash equivalents
Cash and money market funds	38,302	52,181
Recurring \| Money market securities and funds
Cash and cash equivalents
Cash and money market funds	56,683	40,939
Recurring \| Level 1
Other assets
Marketable securities - restricted (SERP)	14	11
Total assets at fair value	94,999	93,131
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	0
Long-term marketable securities
Corporate and municipal debt securities	0	0
Recurring \| Level 1 \| Cash
Cash and cash equivalents
Cash and money market funds	38,302	52,181
Recurring \| Level 1 \| Money market securities and funds
Cash and cash equivalents
Cash and money market funds	56,683	40,939
Recurring \| Level 2
Other assets
Marketable securities - restricted (SERP)	498	485
Total assets at fair value	130,827	462,595
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	105,204	368,214
Long-term marketable securities
Corporate and municipal debt securities	25,125	93,896
Recurring \| Level 2 \| Cash
Cash and cash equivalents
Cash and money market funds	0	0
Recurring \| Level 2 \| Money market securities and funds
Cash and cash equivalents
Cash and money market funds	0	0
Recurring \| Level 3
Other assets
Marketable securities - restricted (SERP)	0	0
Total assets at fair value	0	0
Liabilities:
Contingent consideration	53,654	54,967
Total liabilities at fair value	53,654	54,967
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 securities and funds
Cash and cash equivalents
Cash and money market funds	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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