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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Oct. 07, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Short-term investments | $ 72,535 | $ 72,535 |  | $ 229,200 |
Unrealized gain | (27,300) | (18,400) |  |  |
Contingent consideration | 3,000 | 3,000 |  |  |
Financial liability value | 3,047 | 3,047 |  | 5,775 |
Contingent consideration payments |  | (2,919) | $ (5,800) |  |
4.625% Senior Notes | Senior Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of debt instruments | $ 482,500 | $ 482,500 |  | $ 659,900 |
Stated interest rate | 4.625% | 4.625% |  |  | 4.625%

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