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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 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 | $ 78,755 | $ 40,612 | 47,759 | $ 38,156
Total realized gains included in income | 8,603 | 456 | 19,000 | 4
Changes in unrealized gains/losses included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 10,974 | 1,095 | 36,530 | 4,822
Issuances | 0 | 0 | 0 | 0
Settlements | (3,891) | (957) | (8,848) | (1,776)
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair value, end of period | 94,441 | 41,206 | 94,441 | 41,206
Total realized gains included in income | 8,603 | 456 | 19,000 | 4
Recurring | Available-for-sale Securities |  |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 840 | 15,295 | 15,497 | 15,903
Total realized gains included in income | 2 | 27 | 1,300 | 82
Changes in unrealized gains/losses included in other comprehensive income | 30 | 151 | (3,138) | 631
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (12,787) | (1,143)
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair value, end of period | 872 | 15,473 | 872 | 15,473
Total realized gains included in income | $ 2 | $ 27 | $ 1,300 | $ 82

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