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Investments - Allowance for Credit Loss on Beneficial Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for beneficial interests credit losses, beginning balance | $ (5,530) | $ (7,208) | $ (4,453) | $ 0
Incremental change in allowance for beneficial interests | 2,388 | 0 | 1,435 | 0
Increase in allowance for beneficial interest credit losses for acquisitions | (1,593) | 0 | (1,593) | (2,553)
Credit loss expense on beneficial interests | (216) | (260) | (355) | (429)
Reclassification from non-credit discount to the allowance for losses for increases in the net present value of expected cash flows | 0 | (2,553) | 0 | (2,553)
Net reversal of provision for credit losses due to increases in actual and/or forecasted cash flows | 1,992 | 3,062 | 2,007 | 244
Allowance for beneficial interests credit losses, end balance | (2,959) | (6,959) | (2,959) | (6,959)
Beginning period adjustment for CECL adoption |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for beneficial interests credit losses, beginning balance | $ 0 | $ 0 | $ 0 | $ (1,668)

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- Definition Debt Securities, Available-for-sale, Allowance for Credit Loss, Incremental Increase For Beneficial Interests + References No definition available. + Details
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- Definition Debt Securities, Available-for-sale, Allowance for Credit Loss, Reversal of Provisions For Credit Losses + References No definition available. + Details
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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of increase in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82922868-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922897-210455 + Details
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