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Financial Instrument (Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Cash And Cash Equivalents | $ 325,089 | $ 460,725
Total Investments | 447,229 | 583,675
Short-Term Restricted Cash | 300 | 500
Long-term restricted cash | 2,922 | 4,592
Total assets measured at fair value | 775,540 | 1,049,492
Liabilities |  |
Total liabilities measured at fair value | 172,094 | 169,717
Contingent Consideration [Member] |  |
Liabilities |  |
Total liabilities measured at fair value | 172,094 | 169,717
Cash And Money Market Funds [Member] |  |
Assets |  |
Cash And Cash Equivalents | 137,636 | 327,315
Commercial Paper [Member] |  |
Assets |  |
Cash And Cash Equivalents | 166,453 | 133,185
U.S. Government And Agency Securities [Member] |  |
Assets |  |
Cash And Cash Equivalents | 21,000 | 225
Commercial Paper, Not Included With Cash And Cash Equivalents [Member] |  |
Assets |  |
Total Investments | 127,302 | 187,632
Corporate Debt Securities [Member] |  |
Assets |  |
Total Investments | 49,491 | 8,968
U.S. Government & Agency Securities, Not Included With Cash And Cash Equivalents [Member] |  |
Assets |  |
Total Investments | 270,436 | 387,075
Level 1 [Member] |  |
Assets |  |
Cash And Cash Equivalents | 137,636 | 327,315
Short-Term Restricted Cash | 300 | 500
Long-term restricted cash | 2,922 | 4,592
Total assets measured at fair value | 140,858 | 332,407
Level 1 [Member] | Cash And Money Market Funds [Member] |  |
Assets |  |
Cash And Cash Equivalents | 137,636 | 327,315
Level 2 [Member] |  |
Assets |  |
Cash And Cash Equivalents | 187,453 | 133,410
Total Investments | 447,229 | 583,675
Total assets measured at fair value | 634,682 | 717,085
Level 2 [Member] | Commercial Paper [Member] |  |
Assets |  |
Cash And Cash Equivalents | 166,453 | 133,185
Level 2 [Member] | U.S. Government And Agency Securities [Member] |  |
Assets |  |
Cash And Cash Equivalents | 21,000 | 225
Level 2 [Member] | Commercial Paper, Not Included With Cash And Cash Equivalents [Member] |  |
Assets |  |
Total Investments | 127,302 | 187,632
Level 2 [Member] | Corporate Debt Securities [Member] |  |
Assets |  |
Total Investments | 49,491 | 8,968
Level 2 [Member] | U.S. Government & Agency Securities, Not Included With Cash And Cash Equivalents [Member] |  |
Assets |  |
Total Investments | 270,436 | 387,075
Level 3 [Member] |  |
Liabilities |  |
Total liabilities measured at fair value | 172,094 | 169,717
Level 3 [Member] | Contingent Consideration [Member] |  |
Liabilities |  |
Total liabilities measured at fair value | $ 172,094 | $ 169,717

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