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Marketable Securities - Schedule of Marketable Securities Classified as Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost, Total | $ 1,455,835 | $ 1,495,585
Gross Unrealized Gains | 172 | 191
Gross Unrealized Losses | (101,283) | (114,128)
Fair Value | 1,354,724 | 1,381,648
U.S. Treasury securities [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost, Total | 2,930 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 2,930 | 0
Agency securities [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost, Total | 16,950 | 7,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (872) | (786)
Fair Value | 16,078 | 6,214
Mortgage-backed securities [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost, Total | 40,072 | 45,373
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5,642) | (4,525)
Fair Value | 34,430 | 40,848
Corporate Debt Securities [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost, Total | 1,089,503 | 1,106,688
Gross Unrealized Gains | 172 | 188
Gross Unrealized Losses | (69,461) | (77,802)
Fair Value | 1,020,214 | 1,029,074
Municipal securities [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost, Total | 301,221 | 326,058
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (24,728) | (28,861)
Fair Value | 276,493 | 297,200
Other [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost, Total | 5,159 | 10,466
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (580) | (2,154)
Fair Value | $ 4,579 | $ 8,312

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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