Investments and Fair Value Measurements (Fair Value Measurements) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets:
Debt securities available for sale	$ 91,838	$ 103,906
Total investment securities at fair value	133,338	146,687
Long-term investment securities at fair value	31,057	32,089
Marketable equity securities
Assets:
Total equity securities at fair value	18,962	19,560
Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	22,538	23,221
U.S. Government securities
Assets:
Debt securities available for sale	5,585
Corporate securities
Assets:
Debt securities available for sale	55,324
U.S. mortgage-backed securities
Assets:
Debt securities available for sale	19,173
Foreign fixed-income securities
Assets:
Debt securities available for sale	1,216
Recurring
Assets:
Total investment securities at fair value	133,338	146,687
Long-term investment securities at fair value	31,057	32,089
Total	361,455	333,895
Liabilities:
Fair value of contingent liability	965	2,646
Total	965	2,646
Recurring \| Marketable equity securities
Assets:
Total equity securities at fair value	18,962	19,560
Recurring \| Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	22,538	23,221
Recurring \| Total equity securities at fair value
Assets:
Total equity securities at fair value	41,500	42,781
Recurring \| U.S. Government securities
Assets:
Debt securities available for sale	5,585	6,481
Recurring \| Corporate securities
Assets:
Debt securities available for sale	55,324	47,531
Recurring \| U.S. mortgage-backed securities
Assets:
Debt securities available for sale	19,173	19,572
Recurring \| Commercial paper
Assets:
Debt securities available for sale	10,540	29,103
Recurring \| Foreign fixed-income securities
Assets:
Debt securities available for sale	1,216	1,219
Recurring \| Total debt securities available for sale
Assets:
Debt securities available for sale	91,838	103,906
Recurring \| Money market funds
Assets:
Cash and cash equivalents	153,948	130,583
Recurring \| Commercial paper
Assets:
Cash and cash equivalents	43,002	24,426
Recurring \| Certificates of deposit
Assets:
Cash and cash equivalents	110	110
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total investment securities at fair value	41,500	42,781
Long-term investment securities at fair value	0	0
Total	195,448	173,364
Liabilities:
Fair value of contingent liability	0	0
Total	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Marketable equity securities
Assets:
Total equity securities at fair value	18,962	19,560
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	22,538	23,221
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Total equity securities at fair value
Assets:
Total equity securities at fair value	41,500	42,781
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. Government securities
Assets:
Debt securities available for sale	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate securities
Assets:
Debt securities available for sale	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. mortgage-backed securities
Assets:
Debt securities available for sale	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial paper
Assets:
Debt securities available for sale	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Foreign fixed-income securities
Assets:
Debt securities available for sale	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Total debt securities available for sale
Assets:
Debt securities available for sale	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market funds
Assets:
Cash and cash equivalents	153,948	130,583
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial paper
Assets:
Cash and cash equivalents	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Certificates of deposit
Assets:
Cash and cash equivalents	0
Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Total investment securities at fair value	91,838	103,906
Long-term investment securities at fair value	0	0
Total	134,950	128,442
Liabilities:
Fair value of contingent liability	0	0
Total	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| Marketable equity securities
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| Total equity securities at fair value
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. Government securities
Assets:
Debt securities available for sale	5,585	6,481
Recurring \| Significant Other Observable Inputs (Level 2) \| Corporate securities
Assets:
Debt securities available for sale	55,324	47,531
Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. mortgage-backed securities
Assets:
Debt securities available for sale	19,173	19,572
Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Assets:
Debt securities available for sale	10,540	29,103
Recurring \| Significant Other Observable Inputs (Level 2) \| Foreign fixed-income securities
Assets:
Debt securities available for sale	1,216	1,219
Recurring \| Significant Other Observable Inputs (Level 2) \| Total debt securities available for sale
Assets:
Debt securities available for sale	91,838	103,906
Recurring \| Significant Other Observable Inputs (Level 2) \| Money market funds
Assets:
Cash and cash equivalents	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Assets:
Cash and cash equivalents	43,002	24,426
Recurring \| Significant Other Observable Inputs (Level 2) \| Certificates of deposit
Assets:
Cash and cash equivalents	110	110
Recurring \| Significant Unobservable Inputs (Level 3)
Assets:
Total investment securities at fair value	0	0
Long-term investment securities at fair value	0	0
Total	0	0
Liabilities:
Fair value of contingent liability	965	2,646
Total	965	2,646
Recurring \| Significant Unobservable Inputs (Level 3) \| Marketable equity securities
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Total equity securities at fair value
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. Government securities
Assets:
Debt securities available for sale	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Corporate securities
Assets:
Debt securities available for sale	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. mortgage-backed securities
Assets:
Debt securities available for sale	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Commercial paper
Assets:
Debt securities available for sale	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Foreign fixed-income securities
Assets:
Debt securities available for sale	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Total debt securities available for sale
Assets:
Debt securities available for sale	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Money market funds
Assets:
Cash and cash equivalents	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Commercial paper
Assets:
Cash and cash equivalents	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Certificates of deposit
Assets:
Cash and cash equivalents	$ 0	$ 0

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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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).

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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