Fair Value of Financial Instruments (Schedule of Cash, Cash Equivalents and Debt Investments by Significant Category) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 504,866	$ 384,000
Total Adjusted Cost	1,746,075	1,254,114
Unrealized Gains	549	285
Unrealized Losses	11,922	15,055
Total Fair Value	1,734,702	1,239,344
Current Investments	851,142	515,136
Long-term Investments	390,350	355,200
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	436,393	308,171
Total Adjusted Cost	1,655,042	1,155,525
Unrealized Gains	265	63
Unrealized Losses	11,461	14,355
Total Fair Value	1,643,846	1,141,233
Current Investments	850,443	515,136
Long-term Investments	368,205	332,218
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	22,560	22,760
Unrealized Gains	284	222
Unrealized Losses	461	700
Fair Value	22,383	22,282
Current Investments	699
Long-term Investments	22,145	22,982
US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	1,218,648	847,354
Unrealized Gains	265	63
Unrealized Losses	11,461	14,355
Fair Value	1,207,452	833,062
Current Investments	850,443	515,136
Long-term Investments	368,205	332,218
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	17,700	17,900
Unrealized Losses	461	700
Fair Value	17,239	17,200
Current Investments	699
Long-term Investments	17,001	17,900
Note Receivable [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	4,860	4,860
Unrealized Gains	284	222
Fair Value	5,144	5,082
Long-term Investments	5,144	5,082
Cash [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	68,473	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	360,901	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	$ 75,492	$ 75,694

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

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

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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