Loans - Activity in Portfolio (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Feb. 28, 2025	Mar. 31, 2025	Mar. 31, 2024
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		$ 448,295
Credit loss (reversal) provision, net		(20,228)	$ 24,153
Credit loss allowance at the end of the period		428,067
Activity in loan portfolio
Balance at the beginning of the period		17,953,021	20,219,886
Acquisitions/originations/additional funding		1,934,679	554,693
Capitalized interest		22,343	20,418
Basis of loans sold		(297,319)	(218,597)
Loan maturities/principal repayments		(802,782)	(1,147,302)
Discount accretion/premium amortization		13,964	19,891
Changes in fair value		58,404	(29,013)
Foreign currency translation gain (loss), net		116,986	(99,593)
Credit loss reversal (provision), net		20,228	(24,153)
Loan foreclosure		(50,909)
Transfer to/from other asset classifications or between segments			0
Balance at the end of the period		18,968,615	19,296,230
Funded Commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		448,295
Credit loss (reversal) provision, net		(20,228)
Credit loss allowance at the end of the period		428,067
Activity in loan portfolio
Credit loss reversal (provision), net		20,228
Unfunded commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		31,519
Credit loss (reversal) provision, net		(3,798)
Credit loss allowance at the end of the period		27,721
Unfunded commitments		1,454,299
Activity in loan portfolio
Credit loss reversal (provision), net		3,798
HTM Preferred Intrests
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		14,018
Credit loss (reversal) provision, net		(3,188)
Credit loss allowance at the end of the period		10,830
Unfunded commitments		57,011
Activity in loan portfolio
Credit loss reversal (provision), net		3,188
CMBS
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		21
Credit loss (reversal) provision, net		(21)
Credit loss allowance at the end of the period		0
Unfunded commitments		0
Activity in loan portfolio
Credit loss reversal (provision), net		21
Held-for-Investment Loans
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		448,295
Credit loss allowance at the end of the period		428,067
Held-for-Sale Loans
Activity in allowance for loan losses
Credit loss (reversal) provision, net		0	1,546
Credit loss allowance at the end of the period		0
Activity in loan portfolio
Balance at the beginning of the period		2,516,008	2,645,637
Acquisitions/originations/additional funding		231,109	289,508
Capitalized interest		0	0
Basis of loans sold		(297,319)	(218,597)
Loan maturities/principal repayments		(54,628)	(45,316)
Discount accretion/premium amortization		0	0
Changes in fair value		58,404	(29,013)
Foreign currency translation gain (loss), net		0	0
Credit loss reversal (provision), net		0	(1,546)
Loan foreclosure		(6,938)
Transfer to/from other asset classifications or between segments			48,695
Balance at the end of the period		2,446,636	2,689,368
Commercial loans:
Activity in allowance for loan losses
Credit loss allowance at the end of the period		415,675
Commercial loans: | First Mortgage And Mezzanine Loan | GEORGIA
Activity in loan portfolio
Loan foreclosure	$ (44,000)
Commercial loans: | Funded Commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		436,812
Credit loss (reversal) provision, net		(21,137)
Credit loss allowance at the end of the period		415,675
Activity in loan portfolio
Credit loss reversal (provision), net		21,137
Commercial loans: | Loans Held-for-Investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		16,530
Credit loss (reversal) provision, net		(441)
Credit loss allowance at the end of the period		16,089
Unfunded commitments		1,309,900
Activity in loan portfolio
Credit loss reversal (provision), net		441
Commercial loans: | HTM Preferred Intrests
Activity in allowance for loan losses
Unfunded commitments		20,000
Commercial loans: | Held-for-Investment Loans
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		436,812
Credit loss (reversal) provision, net		(21,137)	23,312
Credit loss allowance at the end of the period		415,675
Activity in loan portfolio
Balance at the beginning of the period		12,895,064	15,078,589
Acquisitions/originations/additional funding		1,108,511	131,886
Capitalized interest		22,343	20,418
Basis of loans sold		0	0
Loan maturities/principal repayments		(312,601)	(892,855)
Discount accretion/premium amortization		7,241	15,090
Changes in fair value		0	0
Foreign currency translation gain (loss), net		115,323	(99,145)
Credit loss reversal (provision), net		21,137	(23,312)
Loan foreclosure		(43,971)
Transfer to/from other asset classifications or between segments			0
Balance at the end of the period		13,813,047	14,230,671
Infrastructure loans:
Activity in allowance for loan losses
Credit loss allowance at the end of the period		12,392
Infrastructure loans: | Funded Commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		11,483
Credit loss (reversal) provision, net		909
Credit loss allowance at the end of the period		12,392
Activity in loan portfolio
Credit loss reversal (provision), net		(909)
Infrastructure loans: | Loans Held-for-Investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		950
Credit loss (reversal) provision, net		(148)
Credit loss allowance at the end of the period		802
Unfunded commitments		87,388
Activity in loan portfolio
Credit loss reversal (provision), net		148
Infrastructure loans: | Held-for-Investment Loans
Activity in allowance for loan losses
Credit loss allowance at beginning of the period		11,483
Credit loss (reversal) provision, net		909	(705)
Credit loss allowance at the end of the period		12,392
Activity in loan portfolio
Balance at the beginning of the period		2,541,949	2,495,660
Acquisitions/originations/additional funding		595,059	133,299
Capitalized interest		0	0
Basis of loans sold		0	0
Loan maturities/principal repayments		(435,553)	(209,131)
Discount accretion/premium amortization		6,723	4,801
Changes in fair value		0	0
Foreign currency translation gain (loss), net		1,663	(448)
Credit loss reversal (provision), net		(909)	705
Loan foreclosure		0
Transfer to/from other asset classifications or between segments			(48,695)
Balance at the end of the period		2,708,932	$ 2,376,191
Residential Loans | Residential Loans
Activity in loan portfolio
Loan foreclosure		$ 6,900