Fair Value of Financial Instruments and Contingent Consideration - Carrying Value (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Total Fair Value
Other noncurrent assets
Marketable securities - restricted (SERP)	$ 630	$ 547
Total assets at fair value	459,476	773,439
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Estimate of Fair Value Measurement
Other noncurrent assets
Marketable securities - restricted (SERP)	7	3
Total assets at fair value	203,692	288,899
Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value Measurement
Other noncurrent assets
Marketable securities - restricted (SERP)	623	544
Total assets at fair value	255,784	484,540
Cash \| Total Fair Value
Assets:
Cash and cash equivalents	148,863	218,550
Cash \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	148,863	218,550
Cash \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	0	0
Money market funds \| Total Fair Value
Assets:
Cash and cash equivalents	54,571	70,090
Money market funds \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	54,571	70,090
Money market funds \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	0	0
Corporate debt securities \| Total Fair Value
Marketable securities
Marketable securities	136,246	133,893
Long term marketable securities
Long term marketable securities	119,166	350,359
Corporate debt securities \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Estimate of Fair Value Measurement
Marketable securities
Marketable securities	251	0
Long term marketable securities
Long term marketable securities	0	256
Corporate debt securities \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value Measurement
Marketable securities
Marketable securities	135,995	133,893
Long term marketable securities
Long term marketable securities	$ 119,166	350,103
U.S. government agency and municipal debt securities \| Total Fair Value
Long term marketable securities
Long term marketable securities		0
U.S. government agency and municipal debt securities \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Estimate of Fair Value Measurement
Long term marketable securities
Long term marketable securities
U.S. government agency and municipal debt securities \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value Measurement
Long term marketable securities
Long term marketable securities

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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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