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Financial Instruments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments in debt securities | $ 735,524 |
Cash, cash equivalents and investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 966,860 | $ 1,045,488
Gross unrealized gains | 10 | 10
Gross unrealized losses | (4,095) | (1,097)
Total investments in debt securities | 962,775 | 1,044,400
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 428,590 | 460,731
Gross unrealized gains | 2 |
Gross unrealized losses | (18) | (5)
Total investments in debt securities | 428,574 | 460,725
Cash and money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 227,251 | 327,316
Total investments in debt securities | 227,251 | 327,316
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 143,964 | 133,190
Gross unrealized gains | 2 |
Gross unrealized losses | (8) | (5)
Total investments in debt securities | 143,958 | 133,185
U.S. government and agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 32,386 | 225
Gross unrealized losses | (9) |
Total investments in debt securities | 32,377 | 224
U.S. Treasury security [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 24,989 |
Gross unrealized losses | (1) |
Total investments in debt securities | 24,988 |
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 538,270 | 584,757
Gross unrealized gains | 8 | 10
Gross unrealized losses | (4,077) | (1,092)
Total investments in debt securities | 534,201 | 583,675
Commercial paper, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 142,266 | 187,705
Gross unrealized gains | 1 |
Gross unrealized losses | (291) | (73)
Total investments in debt securities | 141,976 | 187,632
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 5,322 | 8,964
Gross unrealized gains |  | 9
Gross unrealized losses | (9) | (5)
Total investments in debt securities | 5,313 | 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 | 390,682 | 388,088
Gross unrealized gains | 7 | 1
Gross unrealized losses | (3,777) | (1,014)
Total investments in debt securities | 386,912 | 387,075
Long-term restricted cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 4,982 | 4,592
Total investments in debt securities | 4,982 | 4,592
Short-Term Restricted Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 500 | 500
Total investments in debt securities | $ 500 | $ 500

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