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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

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