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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	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 6,432,381	$ 6,375,093
% of Portfolio	100.00%	100.00%
General CECL Allowance	$ (44,544)
Total carrying value, net	6,387,837	$ 6,375,093
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,359,066	$ 2,167,487
% of Portfolio	36.70%	34.00%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 132,308	$ 110,771
% of Portfolio	2.10%	1.70%
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,236,696	$ 1,274,390
% of Portfolio	19.20%	20.00%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 725,507	$ 728,182
% of Portfolio	11.30%	11.40%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 556,873	$ 614,337
% of Portfolio	8.60%	9.60%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 521,586	$ 564,166
% of Portfolio	8.10%	8.90%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 900,345	$ 915,760
% of Portfolio	14.00%	14.40%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,764,267	$ 1,401,400
% of Portfolio	27.40%	22.00%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,551,144	$ 1,660,162
% of Portfolio	24.10%	26.00%
Residential-for-sale: construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 783,359	$ 692,816
% of Portfolio	12.20%	10.90%
Residential-for-sale: inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 282,034	$ 321,673
% of Portfolio	4.40%	5.10%
Urban Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 622,894	$ 643,706
% of Portfolio	9.70%	10.10%
Healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 355,121	$ 371,423
% of Portfolio	5.50%	5.80%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 294,401	$ 409,864
% of Portfolio	4.60%	6.40%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 779,161	$ 874,049
% of Portfolio	12.10%	13.70%

X

- Definition

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

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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.

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-Publisher FASB
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