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Investments - Disaggregated Gain (Loss) on Equity Method Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair value adjustments, net, pretax | $ 7,601 | $ 16,030 | $ 3,638
Equity Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair value adjustments, net, pretax | 7,601 | 16,208 | 2,945
Less: Realized (gain) loss | (19,140) | (860) | (7,964)
Unrealized gain (loss) | $ (11,539) | $ 15,348 | $ (5,019)

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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