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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 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 | $ 62,129 | $ 39,756 | 47,759 | $ 38,156
Total realized gains (losses) included in income | 6,957 | (278) | 10,397 | (452)
Changes in unrealized gains/losses included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 13,124 | 1,366 | 25,556 | 3,727
Issuances | 0 | 0 | 0 | 0
Settlements | (3,455) | (232) | (4,957) | (819)
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair value, end of period | 78,755 | 40,612 | 78,755 | 40,612
Total realized gains (losses) included in income | 6,957 | (278) | 10,397 | (452)
Recurring | Available-for-sale Securities |  |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 13,513 | 14,767 | 15,497 | 15,903
Total realized gains (losses) included in income | 1,256 | 27 | 1,298 | 55
Changes in unrealized gains/losses included in other comprehensive income | (1,293) | 501 | (3,168) | 480
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Settlements | (12,636) | 0 | (12,787) | (1,143)
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair value, end of period | 840 | 15,295 | 840 | 15,295
Total realized gains (losses) included in income | $ 1,256 | $ 27 | $ 1,298 | $ 55

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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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- 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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