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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
	May 24, 2021	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019	Mar. 31, 2021
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	$ 6,496,977		$ 6,375,093
Loan fundings									3,334,062		876,658
Loan repayments									(1,881,211)		(683,254)
Gain (loss) on foreign currency translation									(93,241)		80,618
Realized loss on investment									(20,767)		(42,465)
Transfer to real estate owned, held for sale									(45,289)		(12,255)
Specific CECL Allowance									30,000		(118,019)
General CECL Allowance									4,514		(10,323)
Deferred Fees									(42,911)		(6,455)
PIK interest, amortization of fees and other items									75,126		65,158
Balance at the close of year		$ 7,857,260			$ 6,496,977				7,857,260		6,496,977		$ 6,375,093
Realized loss on investments									20,767		47,632		12,513
Specific CECL (allowance) reversal	$ 10,000								(30,000)		118,019		13,000
Provision for (reversal of) loan losses, net									(34,773)	[1]	125,600	[1]	20,000
Financing receivable, loan specific, credit loss, expense, net of reversal									(10,000)
Off-balance sheet, credit loss, liability		3,106	$ 2,193	$ 2,444	3,365	$ 3,595	$ 4,119	6,059	3,106		3,365		0	$ 3,794
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)
Balance at the close of year													(27,779)
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									(94,205)
Realized loss on investment									20,767
Realized loss on investments									20,000
Specific CECL (allowance) reversal									30,000
Provision for (reversal of) loan losses, net		$ 0	$ 0	$ (20,000)	$ 0	$ (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
Hotel - Washington D.C.
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Specific CECL (allowance) reversal									$ 10,000
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
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 $30,000 and $(118,019) Specific CECL Reversals (Allowance) for the years ended December 31, 2021 and 2020, respectively, $4,773 and $(10,600) of General CECL Reversals (Allowance) for the years ended December 31, 2021 and 2020, respectively, and a $3,019 reversal of a previously recorded impairment on an equity investment for the year ended December 31, 2020. For the year ended December 31, 2019 the balance represents provision per loan losses as determined by the authoritative guidance at the time.

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