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Investments, Summary of Investments (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) Company | Dec. 31, 2021 USD ($)
Ownership Interests in Private and Public Companies [Abstract] |  |  |
Number of privately held companies in which there is an equity ownership interest of less than 20% | Company |  | 8 |
Number of publicly held companies in which there is an equity ownership interest of less than 20% | Company |  | 3 |
Available-for-sale Securities with Maturity of One Year or Less [Abstract] |  |  |
Amortized cost |  | $ 1,223,522 | $ 612,557
Gross unrealized gains |  | 64 | 792
Gross unrealized losses |  | (12,018) | (345)
Estimated fair value |  | 1,211,568 | 613,004
Available-for-sale Securities with Maturity of More Than One Year [Abstract] |  |  |
Amortized cost |  | 525,314 | 638,615
Gross unrealized gains |  | 130 | 471
Gross unrealized losses |  | (15,621) | (3,966)
Estimated fair value |  | 509,823 | 635,120
Available-for-sale Securities [Abstract] |  |  |
Amortized cost |  | 1,748,836 | 1,251,172
Gross unrealized gains |  | 194 | 1,263
Gross unrealized losses |  | (27,639) | (4,311)
Estimated fair value |  | 1,721,391 | 1,248,124
Equity Securities [Abstract] |  |  |
Amortized cost |  | 35,012 | 27,512
Gross unrealized gains |  | 17,257 | 23,852
Gross unrealized losses |  | (1,358) | (837)
Estimated fair value |  | 50,911 | 50,527
Available-for-sale and Equity Securities [Abstract] |  |  |
Amortized cost |  | 1,783,848 | 1,278,684
Gross unrealized gains |  | 17,451 | 25,115
Gross unrealized losses |  | (28,997) | (5,148)
Estimated fair value |  | 1,772,302 | 1,298,651
Corporate Debt Securities [Member] |  |  |
Available-for-sale Securities with Maturity of One Year or Less [Abstract] |  |  |
Amortized cost | [1] | 513,790 | 383,870
Gross unrealized gains |  | 23 | 728
Gross unrealized losses |  | (4,365) | (226)
Estimated fair value |  | 509,448 | 384,372
Available-for-sale Securities with Maturity of More Than One Year [Abstract] |  |  |
Amortized cost |  | 227,631 | 382,000
Gross unrealized gains |  | 14 | 331
Gross unrealized losses |  | (10,143) | (2,644)
Estimated fair value |  | 217,502 | 379,687
Debt Securities Issued by U.S. Government Agencies [Member] |  |  |
Available-for-sale Securities with Maturity of One Year or Less [Abstract] |  |  |
Amortized cost |  | 133,585 | 48,493
Gross unrealized gains |  | 0 | 19
Gross unrealized losses |  | (1,829) | (18)
Estimated fair value |  | 131,756 | 48,494
Available-for-sale Securities with Maturity of More Than One Year [Abstract] |  |  |
Amortized cost |  | 34,339 | 72,935
Gross unrealized gains |  | 0 | 0
Gross unrealized losses |  | (1,040) | (561)
Estimated fair value |  | 33,299 | 72,374
Debt Securities Issued by the U.S. Treasury [Member] |  |  |
Available-for-sale Securities with Maturity of One Year or Less [Abstract] |  |  |
Amortized cost | [1] | 512,655 | 45,424
Gross unrealized gains |  | 23 | 0
Gross unrealized losses |  | (5,124) | (64)
Estimated fair value |  | 507,554 | 45,360
Available-for-sale Securities with Maturity of More Than One Year [Abstract] |  |  |
Amortized cost |  | 245,030 | 137,635
Gross unrealized gains |  | 0 | 139
Gross unrealized losses |  | (4,109) | (500)
Estimated fair value |  | 240,921 | 137,274
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |  |  |
Available-for-sale Securities with Maturity of One Year or Less [Abstract] |  |  |
Amortized cost |  | 57,484 | 134,770
Gross unrealized gains |  | 18 | 45
Gross unrealized losses |  | (686) | (37)
Estimated fair value |  | 56,816 | 134,778
Available-for-sale Securities with Maturity of More Than One Year [Abstract] |  |  |
Amortized cost |  | 18,314 | 39,909
Gross unrealized gains |  | 116 | 1
Gross unrealized losses |  | (329) | (224)
Estimated fair value |  | 18,101 | 39,686
Other Municipal Debt Securities [Member] |  |  |
Available-for-sale Securities with Maturity of One Year or Less [Abstract] |  |  |
Amortized cost |  | 6,008 |
Gross unrealized gains |  | 0 |
Gross unrealized losses |  | (14) |
Estimated fair value |  | 5,994 |
Available-for-sale Securities with Maturity of More Than One Year [Abstract] |  |  |
Amortized cost |  |  | 6,136
Gross unrealized gains |  |  | 0
Gross unrealized losses |  |  | (37)
Estimated fair value |  |  | 6,099
Publicly Traded Equity Securities [Member] |  |  |
Equity Securities [Abstract] |  |  |
Amortized cost | [2] | 11,897 | 11,897
Gross unrealized gains |  | 0 | 7,145
Gross unrealized losses |  | (1,358) | (837)
Estimated fair value |  | 10,539 | 18,205
Available-for-sale and Equity Securities [Abstract] |  |  |
Unrealized loss on equity investment |  | (7,700) |
Privately Held Equity Securities [Member] |  |  |
Equity Securities [Abstract] |  |  |
Amortized cost | [3] | 23,115 | 15,615
Gross unrealized gains |  | 17,257 | 16,707
Gross unrealized losses |  | 0 | 0
Estimated fair value |  | $ 40,372 | $ 32,322
[1] | Includes investments classified as cash equivalents in our consolidated balance sheets.
[2] | Our equity securities included in other current assets consisted of our investments in publicly traded companies. We recognize publicly traded equity securities at fair value. In the year ended December 31, 2022, we recognized a $7.7 million unrealized non-cash loss in our consolidated statements of operations related to a decrease in the fair value of our investments in publicly traded companies.
[3] | Our equity securities included in deposits and other assets consisted of our investments in privately held companies. We recognize our private company 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 in our consolidated balance sheets.

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