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Marketable Securities - Schedule of Gross Unrealized Losses and Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | $ (3,722) | $ (30,716)
Fair Value Less than 12 Consecutive Months | 127,216 | 601,202
Gross Unrealized Losses 12 Consecutive Months or Longer | (97,561) | (83,412)
Fair Value 12 Consecutive Months or Longer | 1,207,855 | 756,413
Gross Unrealized Losses, Total | (101,283) | (114,128)
Fair Value, Total | 1,335,071 | 1,357,615
U.S. Treasury securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | 0 | 0
Fair Value Less than 12 Consecutive Months | 0 | 0
Gross Unrealized Losses 12 Consecutive Months or Longer | 0 | 0
Fair Value 12 Consecutive Months or Longer | 0 | 0
Gross Unrealized Losses, Total | 0 | 0
Fair Value, Total | 0 | 0
Agency securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (132) | 0
Fair Value Less than 12 Consecutive Months | 9,818 | 0
Gross Unrealized Losses 12 Consecutive Months or Longer | (740) | (786)
Fair Value 12 Consecutive Months or Longer | 6,260 | 6,214
Gross Unrealized Losses, Total | (872) | (786)
Fair Value, Total | 16,078 | 6,214
Mortgage-backed securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (13) | (1,900)
Fair Value Less than 12 Consecutive Months | 150 | 23,229
Gross Unrealized Losses 12 Consecutive Months or Longer | (5,629) | (2,625)
Fair Value 12 Consecutive Months or Longer | 34,279 | 17,619
Gross Unrealized Losses, Total | (5,642) | (4,525)
Fair Value, Total | 34,429 | 40,848
Corporate debt securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (3,446) | (26,680)
Fair Value Less than 12 Consecutive Months | 110,263 | 508,956
Gross Unrealized Losses 12 Consecutive Months or Longer | (66,015) | (51,122)
Fair Value 12 Consecutive Months or Longer | 894,729 | 498,834
Gross Unrealized Losses, Total | (69,461) | (77,802)
Fair Value, Total | 1,004,992 | 1,007,790
Municipal securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (131) | (2,136)
Fair Value Less than 12 Consecutive Months | 6,985 | 69,017
Gross Unrealized Losses 12 Consecutive Months or Longer | (24,597) | (26,725)
Fair Value 12 Consecutive Months or Longer | 268,008 | 225,679
Gross Unrealized Losses, Total | (24,728) | (28,861)
Fair Value, Total | 274,993 | 294,696
Other [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | 0 | 0
Fair Value Less than 12 Consecutive Months | 0 | 0
Gross Unrealized Losses 12 Consecutive Months or Longer | (580) | (2,154)
Fair Value 12 Consecutive Months or Longer | 4,579 | 8,067
Gross Unrealized Losses, Total | (580) | (2,154)
Fair Value, Total | $ 4,579 | $ 8,067

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