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Real Estate Owned and Related Debt (Details) - USD ($) $ in Thousands				3 Months Ended			9 Months Ended
		Jun. 29, 2021	May 24, 2021	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Real estate held-for-sale, impairment										$ 600
Total carrying value, net				$ 7,257,304			$ 7,257,304				$ 6,496,977
Specific CECL (allowance) reversal			$ 10,000	0	$ (550)		(30,000)	$ 139,950
Realized loss on investments			20,000	0	$ 1,037		20,000	$ 17,442
Senior Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net				234,300			234,300
Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net				451,200			451,200
Subordinate Mortgage Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net	[1]			$ 817,759			$ 817,759				$ 1,045,893
Subordinate Mortgage Portfolio Segment | Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Specific CECL (allowance) reversal						$ 10,000
Hotel - Anaheim, CA | Subordinate Mortgage Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Debt related to real estate owned, held for sale									$ 33,000
Hotel - Washington D.C. | Junior Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net												$ 20,000
Hotel - Washington D.C. | Senior Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net												24,500
Payments to acquire mortgage notes receivable			24,500
Hotel - Washington D.C. | Subordinate Mortgage Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Debt related to real estate owned, held for investment		$ 110,000	$ 110,000									$ 110,000
Payments for mortgage loans		$ 110,000
[1] Net of $177,684 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 and $175,000 Specific CECL Allowance and $32,684 and $38,102 General CECL Allowance, respectively.

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- Definition

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- Definition

Amount of realized 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 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
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The cash outflow from the purchase of receivables arising from the mortgage note on real estate.

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-Topic 230
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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