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Investments - Allowance for Credit Loss on Beneficial Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	$ 7,208	$ 0	$ 0	$ 0
Beginning period adjustment for CECL	0	0	(4,221)	0
Reversal of / (Increase in) provision for credit losses on beneficial interests			(184)	0
Increase in allowance for beneficial interest credit losses	2,553	0	2,553	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance	$ (6,959)	$ 0	$ (6,959)	$ 0

X

- Definition

Securities settlement between credit losses and discount

+ References

No definition available.

+ Details

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X

- 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)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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X

- 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.

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- Definition

Amount of expense related to other loss.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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- Definition

Amount of increase (decrease) in valuation and qualifying accounts and reserves.

+ References

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-Publisher FASB
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