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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	100.00%	100.00%
Principal balance	$ 6,488,891	$ 6,375,093
General CECL Allowance	(58,273)
Carrying value	$ 6,430,618	$ 6,375,093
Office
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	27.80%	22.00%
Principal balance	$ 1,803,605	$ 1,401,400
Hotel
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	23.70%	26.00%
Principal balance	$ 1,537,796	$ 1,660,162
Residential-for-sale: construction
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	11.80%	10.90%
Principal balance	$ 763,381	$ 692,816
Residential-for-sale: inventory
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	4.40%	5.10%
Principal balance	$ 283,909	$ 321,673
Urban Retail
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	9.60%	10.10%
Principal balance	$ 623,564	$ 643,706
Healthcare
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	5.50%	5.80%
Principal balance	$ 356,215	$ 371,423
Urban Predevelopment
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	4.70%	6.40%
Principal balance	$ 306,503	$ 409,864
Other
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	12.50%	13.70%
Principal balance	$ 813,918	$ 874,049
New York City
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	35.80%	34.00%
Principal balance	$ 2,319,325	$ 2,167,487
Northeast
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	1.80%	1.70%
Principal balance	$ 118,251	$ 110,771
United Kingdom
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	20.80%	20.00%
Principal balance	$ 1,347,897	$ 1,274,390
West
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	11.50%	11.40%
Principal balance	$ 747,515	$ 728,182
Midwest
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	8.60%	9.60%
Principal balance	$ 557,780	$ 614,337
Southeast
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	7.90%	8.90%
Principal balance	$ 512,469	$ 564,166
Other International
Loans and Leases Receivable Disclosure [Line Items]
% of Portfolio	13.60%	14.40%
Principal balance	$ 885,654	$ 915,760

X

- Definition

Mortgage Loans on Real Estate, Commercial and Consumer, Percentage of Portfolio

+ References

No definition available.

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- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21338-158488

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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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- 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))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

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