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Financial Instruments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments in debt securities | $ 634,682,000 |
Cash, cash equivalents and investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 777,083,000 | $ 1,045,488,000
Gross unrealized gains | 16,000 | 10,000
Gross unrealized losses | (4,781,000) | (1,097,000)
Total investments in debt securities | 772,318,000 | 1,044,400,000
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 325,144,000 | 460,731,000
Gross unrealized gains | 6,000 |
Gross unrealized losses | (61,000) | (5,000)
Total investments in debt securities | 325,089,000 | 460,725,000
Cash And Money Market Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 137,636,000 | 327,316,000
Total investments in debt securities | 137,636,000 | 327,316,000
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 166,514,000 | 133,190,000
Gross unrealized losses | (61,000) | (5,000)
Total investments in debt securities | 166,453,000 | 133,185,000
U.S. Government And Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 20,994,000 | 225,000
Gross unrealized gains | 6,000 |
Total investments in debt securities | 21,000,000 | 224,000
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 451,939,000 | 584,757,000
Gross unrealized gains | 10,000 | 10,000
Gross unrealized losses | (4,720,000) | (1,092,000)
Total investments in debt securities | 447,229,000 | 583,675,000
Commercial Paper, Not Included With Cash And Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 127,626,000 | 187,705,000
Gross unrealized gains | 9,000 |
Gross unrealized losses | (333,000) | (73,000)
Total investments in debt securities | 127,302,000 | 187,632,000
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 49,998,000 | 8,964,000
Gross unrealized gains |  | 9,000
Gross unrealized losses | (507,000) | (5,000)
Total investments in debt securities | 49,491,000 | 8,968,000
U.S. Government & Agency Securities, Not Included With Cash And Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 274,315,000 | 388,088,000
Gross unrealized gains | 1,000 | 1,000
Gross unrealized losses | (3,880,000) | (1,014,000)
Total investments in debt securities | 270,436,000 | 387,075,000
Long-Term Restricted Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,922,000 | 4,592,000
Total investments in debt securities | 2,922,000 | 4,592,000
Short-Term Restricted Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 300,000 | 500,000
Total investments in debt securities | $ 300,000 | $ 500,000

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