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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, 2021 | Mar. 31, 2020
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 | 47,759 | $ 38,156
Total realized gains (losses) included in income | 3,440 | (174)
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end | 0 | 0
Purchases | 12,432 | 2,361
Issuances | 0 | 0
Settlements | (1,502) | (587)
Transfers out of Level 3 | 0 | 0
Fair value, end of period | 62,129 | 39,756
Total realized gains (losses) included in income related to financial assets and liabilities still on the consolidated balance sheet at period-end | 3,440 | (174)
Recurring | Available-for-sale Securities |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Fair value, beginning of period | 15,497 | 15,903
Total realized gains (losses) included in income | 42 | 28
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end | (1,875) | (21)
Purchases | 0 | 0
Issuances | 0 | 0
Settlements | (151) | (1,143)
Transfers out of Level 3 | 0 | 0
Fair value, end of period | 13,513 | 14,767
Total realized gains (losses) included in income related to financial assets and liabilities still on the consolidated balance sheet at period-end | $ 42 | $ 28

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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 http://asc.fasb.org/extlink&oid=123874694&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 http://asc.fasb.org/extlink&oid=123874694&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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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