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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	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 6,476,313	$ 6,375,093
% of Portfolio	100.00%	100.00%
General CECL allowance	$ (39,276)
Carrying value, net	6,437,037	$ 6,375,093
General CECL allowance related to unfunded commitments	3,595	0	$ 4,119	$ 6,059	$ 3,088
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,393,012	$ 2,167,487
% of Portfolio	37.00%	34.00%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 138,448	$ 110,771
% of Portfolio	2.10%	1.70%
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,179,761	$ 1,274,390
% of Portfolio	18.20%	20.00%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 741,971	$ 728,182
% of Portfolio	11.50%	11.40%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 556,011	$ 614,337
% of Portfolio	8.60%	9.60%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 576,420	$ 564,166
% of Portfolio	8.90%	8.90%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 890,690	$ 915,760
% of Portfolio	13.70%	14.40%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,832,607	$ 1,401,400
% of Portfolio	28.30%	22.00%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,578,614	$ 1,660,162
% of Portfolio	24.40%	26.00%
Residential-for-sale: construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 894,610	$ 692,816
% of Portfolio	13.80%	10.90%
Residential-for-sale: inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 150,015	$ 321,673
% of Portfolio	2.30%	5.10%
Urban Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 636,308	$ 643,706
% of Portfolio	9.80%	10.10%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 295,728	$ 409,864
% of Portfolio	4.60%	6.40%
Healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 363,170	$ 371,423
% of Portfolio	5.60%	5.80%
Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 228,674	$ 227,940
% of Portfolio	3.50%	3.60%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 496,587	$ 646,109
% of Portfolio	7.70%	10.10%

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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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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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