Financial Instruments (Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure	$ 460,725,000	$ 81,611,000
Investments Fair Value Disclosure	583,675,000	237,203,000
Short-Term Restricted Cash Fair Value Disclosure	500,000	836,000
Long Term Restricted Cash Fair Value Disclosure	4,592,000	3,500,000
Assets Fair Value Disclosure	1,049,492,000	323,150,000
Liabilities [Abstract]
Liabilities Fair Value Disclosure	169,717,000
Level 1 [Member]
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure	327,315,000	43,040,000
Short-Term Restricted Cash Fair Value Disclosure	500,000	836,000
Long Term Restricted Cash Fair Value Disclosure	4,592,000	3,500,000
Assets Fair Value Disclosure	332,407,000	47,376,000
Level 2 [Member]
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure	133,410,000	38,571,000
Investments Fair Value Disclosure	583,675,000	237,203,000
Assets Fair Value Disclosure	717,085,000	275,774,000
Level 3 [Member]
Liabilities [Abstract]
Liabilities Fair Value Disclosure	169,717,000
Contingent consideration [Member]
Liabilities [Abstract]
Liabilities Fair Value Disclosure	169,717,000
Contingent consideration [Member] \| Level 3 [Member]
Liabilities [Abstract]
Liabilities Fair Value Disclosure	169,717,000
Cash and money market funds [Member]
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure	327,315,000	43,040,000
Cash and money market funds [Member] \| Level 1 [Member]
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure	327,315,000	43,040,000
Commercial paper [Member]
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure	133,185,000	32,537,000
Investments Fair Value Disclosure	187,632,000	112,644,000
Commercial paper [Member] \| Level 2 [Member]
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure	133,185,000	32,537,000
Investments Fair Value Disclosure	187,632,000	112,644,000
U.S. government and agency securities [Member]
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure	225,000	170,000
U.S. government and agency securities [Member] \| Level 2 [Member]
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure	225,000	170,000
U.S. Treasury security [Member]
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure		5,864,000
U.S. Treasury security [Member] \| Level 2 [Member]
Assets [Abstract]
Cash And Cash Equivalents Fair Value Disclosure		5,864,000
Corporate debt securities [Member]
Assets [Abstract]
Investments Fair Value Disclosure	8,968,000	17,456,000
Corporate debt securities [Member] \| Level 2 [Member]
Assets [Abstract]
Investments Fair Value Disclosure	8,968,000	17,456,000
U.S. government & agency securities, not included with cash and cash equivalents [Member]
Assets [Abstract]
Investments Fair Value Disclosure	387,075,000	107,103,000
U.S. government & agency securities, not included with cash and cash equivalents [Member] \| Level 2 [Member]
Assets [Abstract]
Investments Fair Value Disclosure	$ 387,075,000	$ 107,103,000

Long-Term Restricted Cash Fair Value Disclosure

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- Definition

Short-Term Restricted Cash Fair Value Disclosure

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- References

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Fair value of financial and nonfinancial obligations.

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