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Real Estate Owned and Related Debt (Details) - USD ($) $ in Thousands				1 Months Ended	3 Months Ended	12 Months Ended
		Jun. 29, 2021	May 24, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Specific CECL allowance (reversal), net of previously recorded amount						$ 20,000
Real estate held-for-sale, impairment										$ 600
Total carrying value, net				$ 6,496,977		7,857,260	$ 6,496,977
Specific CECL (allowance) reversal			$ 10,000			(30,000)	118,019	$ 13,000
Realized loss on investments						20,767	47,632	$ 12,513
Senior Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net						238,400
Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net						473,200
Subordinate Mortgage Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net	[1]			1,045,893		844,948	$ 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
Specific CECL allowance (reversal), net of previously recorded amount				$ (2,400)
Hotel - Washington D.C.
Debt Securities, Available-for-sale [Line Items]
Specific CECL (allowance) reversal						$ 10,000
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 $178,588 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 and $175,000 Specific CECL Allowance and $33,588 and $38,102 General CECL Allowance, respectively.

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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)
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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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The cash outflow from the purchase of receivables arising from the mortgage note on real estate.

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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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