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Fair Value Measurements (Schedule of Cash, Cash Equivalents and Debt Investments by Significant Category) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | $ 560,609 | $ 384,000
Total Adjusted Cost | 1,812,923 | 1,254,114
Unrealized Gains | 5,654 | 285
Unrealized Losses | 4,258 | 15,055
Total Fair Value | 1,814,319 | 1,239,344
Current Investments | 734,838 | 515,136
Long-term Investments | 518,624 | 355,200
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 432,151 | 308,171
Total Adjusted Cost | 1,652,564 | 1,155,525
Unrealized Gains | 4,365 | 63
Unrealized Losses | 4,090 | 14,355
Total Fair Value | 1,652,839 | 1,141,233
Current Investments | 731,339 | 515,136
Long-term Investments | 489,074 | 332,218
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost | 31,901 | 22,760
Unrealized Gains | 1,289 | 222
Unrealized Losses | 168 | 700
Fair Value | 33,022 | 22,282
Current Investments | 3,499 |
Long-term Investments | 29,550 | 22,982
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost | 1,200,658 | 847,354
Unrealized Gains | 4,352 | 63
Unrealized Losses | 4,083 | 14,355
Fair Value | 1,200,927 | 833,062
Current Investments | 731,339 | 515,136
Long-term Investments | 469,319 | 332,218
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost | 19,755 |
Unrealized Gains | 13 |
Unrealized Losses | 7 |
Fair Value | 19,761 |
Long-term Investments | 19,755 |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost | 17,401 | 17,900
Unrealized Losses | 27 | 700
Fair Value | 17,374 | 17,200
Current Investments | 999 |
Long-term Investments | 16,402 | 17,900
Notes Receivable [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost | 14,500 | 4,860
Unrealized Gains | 1,289 | 222
Unrealized Losses | 141 |
Fair Value | 15,648 | 5,082
Current Investments | 2,500 |
Long-term Investments | 13,148 | 5,082
Cash [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 128,458 | 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 | 355,872 | 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 | $ 76,279 | $ 75,694

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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