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Fair Value Measurements (Fair Values of Financial Instruments Measured On Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Consensus common stock	$ 16,400	$ 27,100
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Consensus common stock	16,404	27,109
Investment in corporate debt securities	15,617	15,699
Total assets measured at fair value	307,172	383,736
Contingent consideration	2,834	2,834
Total liabilities measured at fair value	2,834	2,834
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Consensus common stock	16,404	27,109
Investment in corporate debt securities	15,617	15,699
Total assets measured at fair value	307,172	383,736
Contingent consideration	2,834	2,834
Total liabilities measured at fair value	2,834	2,834
Money market and other funds | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	272,847	340,928
Money market and other funds | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	272,847	340,928
Certificates of deposit | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	2,304
Certificates of deposit | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	2,304
Level 1 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Consensus common stock	16,404	27,109
Investment in corporate debt securities	0	0
Total assets measured at fair value	289,251	368,037
Contingent consideration	0	0
Total liabilities measured at fair value	0	0
Level 1 | Money market and other funds | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	272,847	340,928
Level 1 | Certificates of deposit | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0
Level 2 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Consensus common stock	0	0
Investment in corporate debt securities	0	0
Total assets measured at fair value	2,304	0
Contingent consideration	0	0
Total liabilities measured at fair value	0	0
Level 2 | Money market and other funds | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Level 2 | Certificates of deposit | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	2,304
Level 3 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Consensus common stock	0	0
Investment in corporate debt securities	15,617	15,699
Total assets measured at fair value	15,617	15,699
Contingent consideration	2,834	2,834
Total liabilities measured at fair value	2,834	2,834
Level 3 | Money market and other funds | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	$ 0
Level 3 | Certificates of deposit | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	$ 0

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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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