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Financial Instruments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Total investments in debt securities	$ 771,186
Cash, cash equivalents and investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	840,600	$ 1,045,488
Gross unrealized gains	2	10
Gross unrealized losses	(6,262)	(1,097)
Total investments in debt securities	834,340	1,044,400
Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	304,480	460,731
Gross unrealized losses	(47)	(5)
Total investments in debt securities	304,433	460,725
Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	536,120	584,757
Gross unrealized gains	2	10
Gross unrealized losses	(6,215)	(1,092)
Total investments in debt securities	529,907	583,675
Commercial paper, not included with cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	57,713	187,705
Gross unrealized losses	(305)	(73)
Total investments in debt securities	57,408	187,632
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	50,098	8,964
Gross unrealized gains	2	9
Gross unrealized losses	(622)	(5)
Total investments in debt securities	49,478	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	428,309	388,088
Gross unrealized gains		1
Gross unrealized losses	(5,288)	(1,014)
Total investments in debt securities	423,021	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

X

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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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