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Fair Value of Financial Instruments - Rollforward of Balance Sheet Amounts Within Level 3 Valuation Hierarchy (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Transfers out of Level 3 | $ 0 |
Recurring | Other investments |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Fair value, beginning of period | 100,996 | $ 47,759
Total realized gains included in income | 1,710 | 3,440
Changes in unrealized gains/losses included in other comprehensive income | 0 | 0
Purchases | 7,411 | 12,432
Issuances | 0 | 0
Settlements | (3,423) | (1,502)
Transfers out of Level 3 | 0 | 0
Fair value, end of period | 106,694 | 62,129
Total realized gains included in income | 1,710 | 3,440
Recurring | Available-for-sale Securities |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Fair value, beginning of period | 828 | 15,497
Total realized gains included in income | 2 | 42
Changes in unrealized gains/losses included in other comprehensive income | (10) | (1,875)
Purchases | 0 | 0
Issuances | 0 | 0
Settlements | (158) | (151)
Transfers out of Level 3 | 0 | 0
Fair value, end of period | 662 | 13,513
Total realized gains included in income | $ 2 | $ 42

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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