Fair Value of Financial Instruments (Schedule of Cash, Cash Equivalents and Debt Investments by Significant Category) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 409,727	$ 384,000
Total Adjusted Cost	1,397,839	1,254,114
Unrealized Gains	788	285
Unrealized Losses	10,408	15,055
Total Fair Value	1,388,219	1,239,344
Current Investments	652,858	515,136
Long-term Investments	335,176	355,200
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	336,487	308,171
Total Adjusted Cost	1,301,939	1,155,525
Unrealized Gains	788	63
Unrealized Losses	9,850	14,355
Total Fair Value	1,292,877	1,141,233
Current Investments	652,858	515,136
Long-term Investments	312,594	332,218
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	22,660	22,760
Unrealized Gains		222
Unrealized Losses	558	700
Fair Value	22,102	22,282
Long-term Investments	22,582	22,982
US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	965,452	847,354
Unrealized Gains	788	63
Unrealized Losses	9,850	14,355
Fair Value	956,390	833,062
Current Investments	652,858	515,136
Long-term Investments	312,594	332,218
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	17,800	17,900
Unrealized Losses	480	700
Fair Value	17,320	17,200
Long-term Investments	17,800	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		222
Unrealized Losses	78
Fair Value	4,782	5,082
Long-term Investments	4,782	5,082
Cash [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	73,240	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	260,944	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	$ 75,543	$ 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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