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Financial Instruments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments in debt securities | $ 796,539 |
Cash, cash equivalents and investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 904,608 | $ 1,045,488
Gross unrealized gains | 78 | 10
Gross unrealized losses | (5,535) | (1,097)
Total investments in debt securities | 899,151 | 1,044,400
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 310,508 | 460,731
Gross unrealized gains | 8 |
Gross unrealized losses | (71) | (5)
Total investments in debt securities | 310,445 | 460,725
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 594,100 | 584,757
Gross unrealized gains | 70 | 10
Gross unrealized losses | (5,464) | (1,092)
Total investments in debt securities | 588,706 | 583,675
Commercial paper, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 120,899 | 187,705
Gross unrealized losses | (404) | (73)
Total investments in debt securities | 120,495 | 187,632
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 47,083 | 8,964
Gross unrealized gains |  | 9
Gross unrealized losses | (273) | (5)
Total investments in debt securities | 46,810 | 8,968
U.S. government & agency securities, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 426,118 | 388,088
Gross unrealized gains | 70 | 1
Gross unrealized losses | (4,787) | (1,014)
Total investments in debt securities | 421,401 | 387,075
Long-term restricted cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,922 | 4,592
Total investments in debt securities | 2,922 | 4,592
Short-Term Restricted Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 300 | 500
Total investments in debt securities | $ 300 | $ 500

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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