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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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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).

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