Marketable Securities - Proceeds from Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Fixed maturity debt securities	$ 64,911	$ 59
Proceeds from equity securities	0	0
Proceeds from sales of marketable securities	64,911	59
Fixed maturity debt securities, gross realized gains	0	0
Equity securities, gross realized gains	0	0
Total marketable securities, gross realized gains	0	0
Fix maturity debt securities, gross realized losses	0	0
Equity securities, gross realized losses	0	0
Total marketable securities, gross realized losses	0	0
Fixed maturity debt securities, net realized losses	0	0
Equity securities, net realized losses	0	0
Total marketable securities, net realized losses	$ 0	$ 0

Debt and Equity Securities, Realized Loss

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Debt Securities And Equity Securities, Realized Gain

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Amount of realized gain (loss) on investment in debt and equity securities.

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Amount of realized gain 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

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The cash inflow associated with the sale of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

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