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Fair Value Measurements (Narrative) (Details) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Oct. 07, 2020 | Nov. 15, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Short-term investments | $ 16,404 |  | $ 27,109 |  |
Unrealized losses | $ (10,700) | $ (20,300) |  |  |
Measurement Input, Discount Rate | Minimum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt securities, available-for-sale, measurement input | 0.13 |  | 0.13 |  |
Measurement Input, Discount Rate | Maximum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt securities, available-for-sale, measurement input | 0.14 |  | 0.14 |  |
Measurement Input, Conversion Term | Minimum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt securities, available-for-sale, term | 1 year |  | 1 year |  |
Measurement Input, Conversion Term | Maximum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt securities, available-for-sale, term | 3 years |  | 3 years |  |
4.625% Senior Notes | Senior Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Stated interest rate |  |  |  | 4.625% |
1.75% Convertible Notes | Convertible Debt |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Stated interest rate |  |  |  |  | 1.75%

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