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Secured Borrowings (Details) $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
Secured Borrowings (Details) $ in Thousands	Mar. 31, 2020 USD ($) Option	Feb. 29, 2020 USD ($)	Jan. 31, 2020	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2019 USD ($)
Secured Borrowings
Carrying Value				$ 8,836,320		$ 8,836,320		$ 8,906,048
Loss on extinguishment of debt				(2,207)	$ (2,816)	(2,377)	$ (6,114)
Payment of debt						3,716,558	$ 2,679,056
Revolving credit facility
Secured Borrowings
Maximum borrowing capacity				$ 120,000		$ 120,000
Revolving credit facility \| LIBOR
Secured Borrowings
Pricing margin (as a percent)						3.00%
Woodstar I Portfolio
Secured Borrowings
Pricing margin (as a percent)				2.71%
Maximum Facility Size				$ 217,100		$ 217,100
Loss on extinguishment of debt				$ 2,200
Maturity period				10 years
Payment of debt				$ 117,000
Revolving Credit Agreement
Secured Borrowings
Maximum Facility Size				300,000		300,000
Maximum facility size subject to certain conditions				650,000		$ 650,000
Infrastructure Acquisition Facility
Secured Borrowings
Pricing margin (as a percent)						1.75%
Increase in spread in a subsequent period						0.25%
Property Mortgages - Fixed rate
Secured Borrowings
Maturity period						7 years 7 months 6 days
Collateralized Loan Obligation
Secured Borrowings
Principal Amount									$ 86,600
Principal amount of notes									1,100,000
Principal amount of notes purchased by third-party investors									936,400
Liquidation preference									$ 77,000
Additional Contribution to CLO				85,300
Term loan facility
Secured Borrowings
Maximum borrowing capacity				397,000		$ 397,000
Term loan facility \| LIBOR
Secured Borrowings
Pricing margin (as a percent)						2.50%
Commercial Loans
Secured Borrowings
Maximum Facility Size				8,900,000		$ 8,900,000
Carrying Value				965,900		965,900
Maximum borrowing capacity				$ 950,000		$ 950,000
Commercial Loans \| LIBOR \| Weighted-average
Secured Borrowings
Interest rate (as a percent)				1.86%		1.86%
Residential Loans
Secured Borrowings
Maximum borrowing capacity				$ 400,000		$ 400,000
Infrastructure Loans
Secured Borrowings
Extension term		1 year
CMBS/RMBS
Secured Borrowings
Interest rate (as a percent)				3.50%		3.50%
Maximum Facility Size				$ 0		$ 0
Carrying Value				175,900		175,900
Amount outstanding on a repurchase facility not subject to margin calls				175,900		175,900
Amount outstanding on repurchase facility				$ 41,300		$ 41,300
Pro rata share owned by a non-controlling partner in a consolidated joint venture				49.00%		49.00%
CMBS/RMBS \| LIBOR \| Weighted-average
Secured Borrowings
Interest rate (as a percent)				1.78%		1.78%
CMBS/RMBS \| Certain Facilities
Secured Borrowings
Carrying Value				$ 310,600		$ 310,600
Rolling maturity period						11 months
Maturity period						12 months
Primary beneficiary
Secured Borrowings
Equity Method Investment, Ownership Percentage			51.00%
Secured Borrowings
Secured Borrowings
Pledged Asset Carrying Value				12,137,247		$ 12,137,247
Maximum Facility Size				18,466,600		18,466,600
Principal Amount				8,921,996		8,921,996		9,000,125
Unamortized net discount				(10,189)		(10,189)		(8,347)
Unamortized deferred financing costs				(75,487)		(75,487)		(85,730)
Carrying Value				8,836,320		8,836,320		8,906,048
Increase in available borrowings	$ 250,000
Secured Borrowings \| Revolving credit facility
Secured Borrowings
Equity interests in certain subsidiaries used to secure facilities						3,800,000
Secured Borrowings \| Other Secured Financing
Secured Borrowings
Pledged Asset Carrying Value				4,360,309		4,360,309
Maximum Facility Size				7,251,259		7,251,259
Principal Amount				4,031,297		4,031,297		4,390,668
Secured Borrowings \| Revolving Credit Agreement
Secured Borrowings
Pledged Asset Carrying Value				33,445		33,445
Maximum Facility Size				650,000		650,000
Principal Amount				29,333		$ 29,333		198,955
Secured Borrowings \| Revolving Credit Agreement \| LIBOR
Secured Borrowings
Pricing margin (as a percent)						2.25%
Secured Borrowings \| Commercial Financing Facility
Secured Borrowings
Pledged Asset Carrying Value				91,214		$ 91,214
Maximum Facility Size				73,650		73,650
Principal Amount				73,650		$ 73,650
Maturity period	2 years
Number of extension options \| Option	3
Extended term / option	1 year
Secured Borrowings \| Commercial Financing Facility \| LIBOR
Secured Borrowings
Pricing margin (as a percent)						1.75%
Secured Borrowings \| Commercial Financing Facility \| GBP LIBOR
Secured Borrowings
Pricing margin (as a percent)		1.75%
Secured Borrowings \| Infrastructure Acquisition Facility
Secured Borrowings
Pledged Asset Carrying Value				723,690		$ 723,690
Maximum Facility Size				737,137		737,137
Principal Amount				583,005		583,005		603,642
Secured Borrowings \| Infrastructure Financing Facilities
Secured Borrowings
Pledged Asset Carrying Value				567,315		567,315
Maximum Facility Size				1,250,000		1,250,000
Principal Amount				462,568		$ 462,568		428,206
Maximum borrowing capacity	$ 750,000
Secured Borrowings \| Infrastructure Financing Facilities \| LIBOR
Secured Borrowings
Pricing margin (as a percent)						2.11%
Secured Borrowings \| Property Mortgages - Fixed rate
Secured Borrowings
Pricing margin (as a percent)						3.81%
Pledged Asset Carrying Value				1,302,670		$ 1,302,670
Maximum Facility Size				1,078,072		1,078,072
Principal Amount				1,077,979		1,077,979		1,196,492
Secured Borrowings \| Property Mortgages - Variable rate
Secured Borrowings
Pledged Asset Carrying Value				951,634		951,634
Maximum Facility Size				945,400		945,400
Principal Amount				926,262		$ 926,262		696,503
Secured Borrowings \| Property Mortgages - Variable rate \| LIBOR
Secured Borrowings
Pricing margin (as a percent)						2.53%
Secured Borrowings \| Term Loan and Revolver
Secured Borrowings
Maximum Facility Size				517,000		$ 517,000
Principal Amount				397,000		$ 397,000		399,000
Secured Borrowings \| FHLB
Secured Borrowings
Pricing margin (as a percent)						1.99%
Pledged Asset Carrying Value				690,341		$ 690,341
Maximum Facility Size				2,000,000		2,000,000
Principal Amount				481,500		481,500		867,870
Secured Borrowings \| Collateralized Loan Obligation
Secured Borrowings
Maximum borrowing capacity	$ 2,000,000
Additional extension term	4 years
Secured Borrowings \| Repurchase Agreements
Secured Borrowings
Pledged Asset Carrying Value				7,776,938		7,776,938
Maximum Facility Size				11,215,341		11,215,341
Principal Amount				4,890,699		4,890,699		4,609,457
Secured Borrowings \| Commercial Loans
Secured Borrowings
Pledged Asset Carrying Value				6,293,458		6,293,458
Maximum Facility Size				9,181,700		9,181,700
Principal Amount				4,024,642		4,024,642		3,640,620
Maximum borrowing capacity		$ 1,800,000
Increase in available borrowings		$ 200,000
Secured Borrowings \| Residential Loans
Secured Borrowings
Pledged Asset Carrying Value				10,172		10,172
Maximum Facility Size				400,000		400,000
Principal Amount				7,669		$ 7,669		11,835
Secured Borrowings \| Residential Loans \| LIBOR
Secured Borrowings
Pricing margin (as a percent)						2.58%
Secured Borrowings \| Infrastructure Loans
Secured Borrowings
Pledged Asset Carrying Value				194,283		$ 194,283
Maximum Facility Size				500,000		500,000
Principal Amount				160,483		$ 160,483		188,198
Secured Borrowings \| Infrastructure Loans \| LIBOR
Secured Borrowings
Pricing margin (as a percent)						2.00%
Secured Borrowings \| Conduit Loans
Secured Borrowings
Pledged Asset Carrying Value				182,001		$ 182,001
Maximum Facility Size				350,000		350,000
Principal Amount				134,874		$ 134,874		86,575
Extension term		1 year
Extended term / option		1 year
Secured Borrowings \| Conduit Loans \| LIBOR
Secured Borrowings
Pricing margin (as a percent)						1.86%
Secured Borrowings \| CMBS/RMBS
Secured Borrowings
Pledged Asset Carrying Value				1,097,024		$ 1,097,024
Maximum Facility Size				783,641		783,641
Principal Amount				$ 563,031		$ 563,031		$ 682,229
Maturity period			12 months
Secured Borrowings \| CMBS/RMBS \| One-month LIBOR \| Minimum
Secured Borrowings
Pricing margin (as a percent)			1.35%
Secured Borrowings \| CMBS/RMBS \| One-month LIBOR \| Maximum
Secured Borrowings
Pricing margin (as a percent)			1.85%
Repurchase Agreements \| Collateralized Loan Obligation
Secured Borrowings
Maximum borrowing capacity	$ 500,000