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Schedule IV - Mortgage Loans on Real Estate - Summary of Changes in Carrying Amounts of Mortgage Loans (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year				$ 6,375,093	$ 6,375,093	$ 4,927,593
Loan fundings					876,658	3,435,457
Loan repayments					(683,254)	(2,037,322)
Gain (loss) on foreign currency translation					80,618	43,649
Realized loss on investment					(42,465)	2,487
Transfer to Real estate owned, held for sale					(12,255)	0
Specific CECL Allowance					(118,019)	(35,000)
General CECL Allowance (Reversal)					(10,323)	0
Deferred Fees					(6,455)	(46,275)
PIK interest, amortization of fees and other items					65,158	84,504
Balance at close of the year					6,496,977	6,375,093	$ 4,927,593
Specific CECL allowance (reversal)					118,019	13,000
Provision for loan losses and impairments, net	[1]				125,600	20,000	20,000
Financing receivable, loan specific, credit loss, expense, net of reversal					(10,000)
Provision for loan and lease losses and impairment						35,000
Off-Balance Sheet, Credit Loss, Liability		$ 3,595	$ 4,119	6,059	3,365	0		$ 3,088
Adjustment due to Adoption of ASU
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year				(27,779)	(27,779)	0
Balance at close of the year						(27,779)	$ 0
Off-Balance Sheet, Credit Loss, Liability						3,088
Commercial Mortgage and Subordinated Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Gain (loss) on foreign currency translation					80,832
Realized loss on investment					42,465
Transfer to Real estate owned, held for sale					(12,255)
Specific CECL allowance (reversal)					118,019
Provision for loan losses and impairments, net		$ (550)	$ 5,500	$ 150,000
Affiliated Entity | Commercial Mortgage and Subordinated Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Cash flows between transferor and transferee, proceeds from new transfers, amount funded						208,500
Sale of Mezzanine Loan | Commercial Mortgage and Subordinated Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Cash flows between transferor and transferee, proceeds from new transfers, amount funded						152,600
Residential Condominium - Bethesda, MD
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Specific CECL allowance (reversal)					1,100
Residential Condominium - Bethesda, MD | Commercial Mortgage and Subordinated Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Realized loss on investment					(11,100)
Specific CECL allowance (reversal)					11,100
Provision for loan and lease losses and impairment						3,000
Retail Center - Cincinnati, OH
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Specific CECL allowance (reversal)					47,000
Loan And Leases Receivable, Cost Recovery					1,800	1,400
Retail Center - Cincinnati, OH | Commercial Mortgage and Subordinated Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan and lease losses and impairment						32,000
Multifamily - Williston, ND | Commercial Mortgage and Subordinated Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Realized loss on investment						(12,500)
Provision for loan losses and impairments, net						$ 15,000
Miscellaneous Properties | Commercial Mortgage and Subordinated Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Realized loss on investment					(26,000)
Specific CECL allowance (reversal)					24,500
Miscellaneous Properties Two | Commercial Mortgage and Subordinated Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Realized loss on investment					$ (5,200)
[1] Comprised of $118,019 of Specific CECL Allowance, $10,600 of General CECL Allowance, and a $3,019 reversal of a previously recorded impairment on an equity investment for the year ended December 31, 2020, respectively. For the years ended December 31, 2019 and 2018 the balance represents provision per loan losses as determined by the authoritative guidance at the time.

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-Number 210
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