Fair Value of Financial Instruments (Schedule of Cash, Cash Equivalents and Debt Investments by Significant Category) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 384,000	$ 815,374
Total Adjusted Cost	1,254,114	1,334,662
Unrealized Gains	285
Unrealized Loss	15,055	1,116
Total Fair Value	1,239,344	1,333,546
Current Investments	515,136	260,945
Long-term Investments	355,200	258,343
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	308,171	695,735
Total Adjusted Cost	1,155,525	1,197,023
Unrealized Gains	63
Unrealized Loss	14,355	1,116
Total Fair Value	1,141,233	1,195,907
Current Investments	515,136	260,945
Long-term Investments	332,218	240,343
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted Cost	22,760	18,000
Unrealized Gains	222
Unrealized Loss	700
Fair Value	22,282	18,000
Long-term Investments	22,982	18,000
US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted Cost	847,354	501,288
Unrealized Gains	63
Unrealized Loss	14,355	1,116
Fair Value	833,062	500,172
Current Investments	515,136	260,945
Long-term Investments	332,218	240,343
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted Cost	17,900	18,000
Unrealized Loss	700
Fair Value	17,200	18,000
Long-term Investments	17,900	18,000
Note Receivable [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted Cost	4,860
Unrealized Gains	222
Fair Value	5,082
Long-term Investments	5,082
Cash [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	75,829	119,639
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	232,477	547,530
Time Deposits [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 75,694	$ 148,205

Cash And Cash Equivalents At Carrying Value And Available For Sale Debt Securities

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Cash And Cash Equivalents At Carrying Value And Available For Sale Debt Securities Amortized Cost Basis

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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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Amortized cost of 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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