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Secured Borrowings (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
Secured Borrowings (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Aug. 31, 2019
Secured Borrowings
Carrying Value		$ 10,895,932		$ 10,146,190
Maximum borrowing capacity	$ 375,000	1,000,000
Payment of debt		2,001,336	$ 1,923,754
Revolving credit facility
Secured Borrowings
Equity interests in certain subsidiaries used to secure facilities		4,200,000
Maximum borrowing capacity		$ 120,000
Revolving credit facility \| LIBOR
Secured Borrowings
Interest rate (as a percent)		3.00%
Residential Repurchase Facility \| One-month LIBOR
Secured Borrowings
Floor interest rate (as a percent)	0.25%
Residential Repurchase Facility \| One-month LIBOR \| Maximum
Secured Borrowings
Pricing margin (as a percent)	2.50%
Spread (as a percent)	2.50%
Woodstar I Portfolio
Secured Borrowings
Maximum borrowing capacity		$ 82,900
Maturity period		7 years
Payment of debt		$ 4,900
Woodstar I Portfolio \| LIBOR
Secured Borrowings
Pricing margin (as a percent)		4.36%
Spread (as a percent)		4.36%
Revolving Credit Agreement
Secured Borrowings
Maximum Facility Size		$ 300,000
Maximum facility size subject to certain conditions		$ 650,000
Infrastructure Acquisition Facility
Secured Borrowings
Pricing margin (as a percent)		2.00%
Spread (as a percent)		2.00%
Property Mortgages - Fixed rate
Secured Borrowings
Maturity period		6 years 6 months
Collateralized Loan Obligation
Secured Borrowings
Principal Amount					$ 86,600
Principal amount of notes					1,100,000
Liquidation preference					$ 77,000
Term loan facility
Secured Borrowings
Maximum borrowing capacity		$ 643,400
Floor interest rate (as a percent)		0.75%
Term loan facility \| LIBOR + 2.50%
Secured Borrowings
Pricing margin (as a percent)		2.50%
Maximum borrowing capacity		$ 394,000
Spread (as a percent)		2.50%
Term loan facility \| LIBOR + 3.50%
Secured Borrowings
Pricing margin (as a percent)		3.50%
Maximum borrowing capacity		$ 249,400
Spread (as a percent)		3.50%
Commercial Loans
Secured Borrowings
Maximum Facility Size		$ 9,200,000
Carrying Value		$ 1,900,000
Commercial Loans \| LIBOR \| Weighted-average
Secured Borrowings
Interest rate (as a percent)		2.01%
CMBS/RMBS
Secured Borrowings
Interest rate (as a percent)		3.29%
Carrying Value		$ 212,000
Amount outstanding on a repurchase facility not subject to margin calls		212,000
Amount outstanding on repurchase facility		$ 38,300
Pro rata share owned by a non-controlling partner in a consolidated joint venture		49.00%
CMBS/RMBS \| LIBOR \| Weighted-average
Secured Borrowings
Interest rate (as a percent)		1.92%
CMBS/RMBS \| Certain Facilities
Secured Borrowings
Carrying Value		$ 280,300
Rolling maturity period		11 months
Maturity period		12 months
Secured Borrowings
Secured Borrowings
Pledged Asset Carrying Value		$ 14,068,476
Maximum Facility Size		18,241,369
Principal Amount		10,977,193		10,233,589
Unamortized net discount		(13,149)		(13,569)
Unamortized deferred financing costs		(68,112)		(73,830)
Carrying Value		10,895,932		10,146,190
Secured Borrowings \| Residential Repurchase Facility
Secured Borrowings
Maturity period	1 year
Secured Borrowings \| Residential Repurchase Facility \| One-month LIBOR \| Minimum
Secured Borrowings
Pricing margin (as a percent)	2.00%
Spread (as a percent)	2.00%
Secured Borrowings \| Other Secured Financing
Secured Borrowings
Pledged Asset Carrying Value		3,995,660
Maximum Facility Size		5,653,479
Principal Amount		4,029,705		4,424,782
Secured Borrowings \| Revolving Credit Agreement
Secured Borrowings
Pledged Asset Carrying Value		304,076
Maximum Facility Size		650,000
Principal Amount		$ 223,302		43,014
Secured Borrowings \| Revolving Credit Agreement \| LIBOR
Secured Borrowings
Pricing margin (as a percent)		2.25%
Spread (as a percent)		2.25%
Secured Borrowings \| Commercial Financing Facility
Secured Borrowings
Pledged Asset Carrying Value		$ 101,559
Maximum Facility Size		81,847
Principal Amount		$ 81,847		81,218
Secured Borrowings \| Commercial Financing Facility \| LIBOR
Secured Borrowings
Pricing margin (as a percent)		1.75%
Spread (as a percent)		1.75%
Secured Borrowings \| Residential Financing Facility
Secured Borrowings
Interest rate (as a percent)		3.50%
Pledged Asset Carrying Value		$ 163,545
Maximum Facility Size		250,000
Principal Amount		1,515		215,024
Secured Borrowings \| Infrastructure Acquisition Facility
Secured Borrowings
Pledged Asset Carrying Value		525,611
Maximum Facility Size		517,498
Principal Amount		414,503		467,450
Secured Borrowings \| Infrastructure Financing Facilities
Secured Borrowings
Pledged Asset Carrying Value		699,684
Maximum Facility Size		1,250,000
Principal Amount		$ 548,956		538,645
Secured Borrowings \| Infrastructure Financing Facilities \| LIBOR
Secured Borrowings
Pricing margin (as a percent)		2.04%
Spread (as a percent)		2.04%
Secured Borrowings \| Property Mortgages - Fixed rate
Secured Borrowings
Interest rate (as a percent)		4.03%
Pledged Asset Carrying Value		$ 1,271,385
Maximum Facility Size		1,155,306
Principal Amount		1,155,306		1,077,528
Secured Borrowings \| Property Mortgages - Variable rate
Secured Borrowings
Pledged Asset Carrying Value		929,800
Maximum Facility Size		985,453
Principal Amount		$ 960,901		960,903
Secured Borrowings \| Property Mortgages - Variable rate \| LIBOR
Secured Borrowings
Pricing margin (as a percent)		2.59%
Spread (as a percent)		2.59%
Secured Borrowings \| Term Loan and Revolver
Secured Borrowings
Maximum Facility Size		$ 763,375
Principal Amount		643,375		645,000
Secured Borrowings \| FHLB
Secured Borrowings
Principal Amount				396,000
Secured Borrowings \| First Mortgage And Mezzanine
Secured Borrowings
Principal Amount		$ 600,000
Secured Borrowings \| First Mortgage And Mezzanine \| LIBOR
Secured Borrowings
Interest rate (as a percent)		3.34%
Secured Borrowings \| First Mortgage And Mezzanine \| LIBOR \| Weighted-average
Secured Borrowings
Pricing margin (as a percent)		2.07%
Spread (as a percent)		2.07%
Secured Borrowings \| Repurchase Agreements
Secured Borrowings
Pledged Asset Carrying Value		$ 10,072,816
Maximum Facility Size		12,587,890
Principal Amount		6,947,488		5,808,807
Secured Borrowings \| Commercial Loans
Secured Borrowings
Pledged Asset Carrying Value		8,088,081
Maximum Facility Size		9,164,525
Principal Amount		5,592,652		4,878,939
Secured Borrowings \| Residential Loans
Secured Borrowings
Pledged Asset Carrying Value		428,877
Maximum Facility Size		1,750,000
Principal Amount		$ 328,620		22,590
Secured Borrowings \| Residential Loans \| LIBOR
Secured Borrowings
Pricing margin (as a percent)		2.09%
Spread (as a percent)		2.09%
Secured Borrowings \| Infrastructure Loans
Secured Borrowings
Pledged Asset Carrying Value		$ 295,516
Maximum Facility Size		500,000
Principal Amount		$ 246,136		232,961
Secured Borrowings \| Infrastructure Loans \| LIBOR
Secured Borrowings
Pricing margin (as a percent)		2.00%
Spread (as a percent)		2.00%
Secured Borrowings \| Conduit Loans
Secured Borrowings
Pledged Asset Carrying Value		$ 147,523
Maximum Facility Size		350,000
Principal Amount		$ 111,087		53,554
Secured Borrowings \| Conduit Loans \| LIBOR
Secured Borrowings
Pricing margin (as a percent)		2.15%
Spread (as a percent)		2.15%
Secured Borrowings \| CMBS/RMBS
Secured Borrowings
Pledged Asset Carrying Value		$ 1,112,819
Maximum Facility Size		823,365
Principal Amount		$ 668,993		$ 620,763