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Fair Value of Financial Instruments (Schedule of Cash, Cash Equivalents and Debt Investments by Significant Category) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 602,307	$ 384,000
Total Adjusted Cost	1,886,558	1,254,114
Unrealized Gains	804	285
Unrealized Losses	8,630	15,055
Total Fair Value	1,878,732	1,239,344
Current Investments	851,699	515,136
Long-term Investments	432,836	355,200
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	515,678	308,171
Total Adjusted Cost	1,775,469	1,155,525
Unrealized Gains	520	63
Unrealized Losses	8,512	14,355
Total Fair Value	1,767,477	1,141,233
Current Investments	850,900	515,136
Long-term Investments	408,891	332,218
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	24,460	22,760
Unrealized Gains	284	222
Unrealized Losses	118	700
Fair Value	24,626	22,282
Current Investments	799
Long-term Investments	23,945	22,982
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	1,259,791	847,354
Unrealized Gains	520	63
Unrealized Losses	8,512	14,355
Fair Value	1,251,799	833,062
Current Investments	850,900	515,136
Long-term Investments	408,891	332,218
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	17,600	17,900
Unrealized Losses	118	700
Fair Value	17,482	17,200
Current Investments	799
Long-term Investments	16,801	17,900
Notes Receivable [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	6,860	4,860
Unrealized Gains	284	222
Fair Value	7,144	5,082
Long-term Investments	7,144	5,082
Cash [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	86,629	75,829
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	439,176	232,477
Time Deposits [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 76,502	$ 75,694

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Cash And Cash Equivalents At Carrying Value And Debt Securities, Held-to-Maturity, Amortized Cost

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