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Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Investments [Abstract] |
Contract Maturity of Available-for-Sale Securities | The following table summarizes the contract maturity of the available-for-sale securities we held as of December 31, 2023:
One year or less |  |  | 68 | %
After one year but within two years |  |  | 24 | %
After two years but within three and a half years |  |  | 8 | %
Total |  |  | 100 | %
Summary of Investments | The following is a summary of our investments (in thousands):
|  | Amortized |  |  | Gross Unrealized |  |  | Estimated |
December 31, 2023 |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities (1) |  | $ | 559,967 |  |  | $ | 157 |  |  | $ | (2,625 | ) |  | $ | 557,499 |
Debt securities issued by U.S. government agencies |  |  | 224,711 |  |  |  | 64 |  |  |  | (611 | ) |  |  | 224,164 |
Debt securities issued by the U.S. Treasury (1) |  |  | 513,784 |  |  |  | 152 |  |  |  | (1,889 | ) |  |  | 512,047 |
Debt securities issued by states of the U.S. and political subdivisions of the states |  |  | 17,757 |  |  |  | 42 |  |  |  | (113 | ) |  |  | 17,686 |
Total securities with a maturity of one year or less |  |  | 1,316,219 |  |  |  | 415 |  |  |  | (5,238 | ) |  |  | 1,311,396 |
Corporate debt securities |  |  | 243,151 |  |  |  | 1,270 |  |  |  | (692 | ) |  |  | 243,729 |
Debt securities issued by U.S. government agencies |  |  | 110,138 |  |  |  | 547 |  |  |  | (21 | ) |  |  | 110,664 |
Debt securities issued by the U.S. Treasury |  |  | 294,873 |  |  |  | 1,239 |  |  |  | (480 | ) |  |  | 295,632 |
Debt securities issued by states of the U.S. and political subdivisions of the states |  |  | 3,466 |  |  |  | 7 |  |  |  | (4 | ) |  |  | 3,469 |
Total securities with a maturity of more than one year |  |  | 651,628 |  |  |  | 3,063 |  |  |  | (1,197 | ) |  |  | 653,494 |
Total available-for-sale securities |  | $ | 1,967,847 |  |  | $ | 3,478 |  |  | $ | (6,435 | ) |  | $ | 1,964,890 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Publicly traded equity securities included in other current assets (2) |  | $ | 11,897 |  |  | $ | 236 |  |  | $ | (5,832 | ) |  | $ | 6,301 |
Privately held securities included in deposits and other assets (3) |  |  | 23,115 |  |  |  | 25,001 |  |  |  | (5,125 | ) |  |  | 42,991 |
Total equity securities |  | $ | 35,012 |  |  | $ | 25,237 |  |  | $ | (10,957 | ) |  | $ | 49,292 |
Total available-for-sale and equity securities |  | $ | 2,002,859 |  |  | $ | 28,715 |  |  | $ | (17,392 | ) |  | $ | 2,014,182 |
|  | Amortized |  |  | Gross Unrealized |  |  | Estimated |
December 31, 2022 |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities (1) |  | $ | 513,790 |  |  | $ | 23 |  |  | $ | (4,365 | ) |  | $ | 509,448 |
Debt securities issued by U.S. government agencies |  |  | 133,585 |  |  |  | — |  |  |  | (1,829 | ) |  |  | 131,756 |
Debt securities issued by the U.S. Treasury (1) |  |  | 512,655 |  |  |  | 23 |  |  |  | (5,124 | ) |  |  | 507,554 |
Debt securities issued by states of the U.S. and political subdivisions of the states |  |  | 57,484 |  |  |  | 18 |  |  |  | (686 | ) |  |  | 56,816 |
Other municipal debt securities |  |  | 6,008 |  |  |  | — |  |  |  | (14 | ) |  |  | 5,994 |
Total securities with a maturity of one year or less |  |  | 1,223,522 |  |  |  | 64 |  |  |  | (12,018 | ) |  |  | 1,211,568 |
Corporate debt securities |  |  | 227,631 |  |  |  | 14 |  |  |  | (10,143 | ) |  |  | 217,502 |
Debt securities issued by U.S. government agencies |  |  | 34,339 |  |  |  | — |  |  |  | (1,040 | ) |  |  | 33,299 |
Debt securities issued by the U.S. Treasury |  |  | 245,030 |  |  |  | — |  |  |  | (4,109 | ) |  |  | 240,921 |
Debt securities issued by states of the U.S. and political subdivisions of the states |  |  | 18,314 |  |  |  | 116 |  |  |  | (329 | ) |  |  | 18,101 |
Total securities with a maturity of more than one year |  |  | 525,314 |  |  |  | 130 |  |  |  | (15,621 | ) |  |  | 509,823 |
Total available-for-sale securities |  | $ | 1,748,836 |  |  | $ | 194 |  |  | $ | (27,639 | ) |  | $ | 1,721,391 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Publicly traded equity securities included in other current assets (2) |  | $ | 11,897 |  |  | $ | — |  |  | $ | (1,358 | ) |  | $ | 10,539 |
Privately held equity securities included in deposits and other assets (3) |  |  | 23,115 |  |  |  | 17,257 |  |  |  | — |  |  |  | 40,372 |
Total equity securities |  | $ | 35,012 |  |  | $ | 17,257 |  |  | $ | (1,358 | ) |  | $ | 50,911 |
Total available-for-sale and equity securities |  | $ | 1,783,848 |  |  | $ | 17,451 |  |  | $ | (28,997 | ) |  | $ | 1,772,302 |
________________
(1) | Includes investments classified as cash equivalents in our consolidated balance sheets.
(2) | Our publicly traded equity securities are included in other current assets. We recognize publicly traded equity securities at fair value. In the year ended December 31, 2023, we recorded a $4.2 million net unrealized loss in our consolidated statements of operations related to changes in the fair value of our investments in publicly traded companies.
(3) | Our privately held equity securities are included in deposits and other assets. We recognize our privately held equity securities at cost minus impairments, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer, which are Level 3 inputs. In the year ended December 31, 2023, we recorded a $2.6 million net unrealized gain in our consolidated statements of operations related to changes in the fair value of our investments in privately held companies.
Temporarily Impaired Investments | The following is a summary of our investments we considered to be temporarily impaired at December 31, 2023 (in thousands, except for number of investments):
|  |  |  |  | Less than 12 Months of Temporary Impairment |  |  | More than 12 Months of Temporary Impairment |  |  | Total Temporary Impairment |
|  | Number of Investments |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
Corporate debt securities |  |  | 297 |  |  | $ | 323,708 |  |  | $ | (553 | ) |  | $ | 178,183 |  |  | $ | (2,764 | ) |  | $ | 501,891 |  |  | $ | (3,317 | )
Debt securities issued by U.S. government agencies |  |  | 63 |  |  |  | 199,372 |  |  |  | (246 | ) |  |  | 14,777 |  |  |  | (386 | ) |  |  | 214,149 |  |  |  | (632 | )
Debt securities issued by the U.S. Treasury |  |  | 34 |  |  |  | 325,966 |  |  |  | (1,031 | ) |  |  | 131,000 |  |  |  | (1,338 | ) |  |  | 456,966 |  |  |  | (2,369 | )
Debt securities issued by states of the U.S. and political subdivisions of the states |  |  | 61 |  |  |  | 8,352 |  |  |  | (17 | ) |  |  | 7,888 |  |  |  | (100 | ) |  |  | 16,240 |  |  |  | (117 | )
Total temporarily impaired securities |  |  | 455 |  |  | $ | 857,398 |  |  | $ | (1,847 | ) |  | $ | 331,848 |  |  | $ | (4,588 | ) |  | $ | 1,189,246 |  |  | $ | (6,435 | )

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