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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 8,708,214	$ 7,890,848
General CECL allowance	(26,224)	(33,588)
Carrying value, net	$ 8,681,990	$ 7,857,260
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	100.00%	100.00%
General CECL Allowance on unfunded commitments	$ 4,347	$ 3,106	$ 3,365
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,470,532	$ 2,297,286
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	28.40%	29.10%
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,049,493	$ 2,000,661
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	23.50%	25.40%
Other Europe
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,542,462	$ 1,295,870
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	17.70%	16.40%
Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	540.00%	2.60%
Germany
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	490.00%	6.10%
Spain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.80%	3.30%
Sweden
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	280.00%	3.60%
Ireland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.70%	0.80%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 592,756	$ 689,274
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.80%	8.70%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 642,542	$ 708,920
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	7.40%	9.00%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 584,247	$ 356,097
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.70%	4.50%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 826,182	$ 542,740
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.50%	6.90%
Percentage of Portfolio	30.00%	0.30%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	550.00%	1.50%
Southwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	230.00%	3.50%
Mid-Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	140.00%	1.60%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,117,079	$ 1,875,439
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	24.30%	23.80%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,671,006	$ 1,700,779
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	19.20%	21.60%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,537,541	$ 1,434,186
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	17.70%	18.20%
Retail Site
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,364,752	$ 1,126,332
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	15.70%	14.30%
Health Care
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 575,144	$ 316,321
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.60%	4.00%
Mixed Use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 559,809	$ 269,839
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.40%	3.40%
Industrial Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 296,860	$ 377,068
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	3.40%	4.80%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 586,023	$ 790,884
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.70%	9.90%
Parking Garage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.10%	3.30%
Caravan Park
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.30%	2.80%
Multifamily Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio		2.20%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	130.00%	1.60%

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