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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