Repurchase Agreements, Loan Participations Sold, Notes Payable and Secured Term Loan, Net - Summary of Repurchase Agreements (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020
Repurchase Agreement Counterparty [Line Items]
Facility Amount		$ 4,336,171		$ 4,050,000
Repurchase agreements		3,489,511		2,685,203
Undrawn Capacity		$ 846,660		$ 1,364,797
JP Morgan Chase Bank NA Main Pool [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity		Jun. 29, 2025	[1]	Jun. 29, 2022
Fully Extended Maturity (1)		Jun. 29, 2027	[1],[2]	Jun. 29, 2024	[3]
Facility Amount		$ 1,250,000	[1]	$ 1,250,000
Repurchase agreements		1,173,280	[1]	937,800
Undrawn Capacity		$ 76,720	[1]	$ 312,200
JP Morgan Chase Bank NA Side Car [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity	[4]	May 27, 2023
Fully Extended Maturity (1)	[2],[4]	May 27, 2024
Facility Amount	[4]	$ 271,171
Repurchase agreements	[4]	215,003
Undrawn Capacity	[4]	$ 56,168
Morgan Stanley Bank NA [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity		Jan. 26, 2023	[5]	Jan. 26, 2022	[6]
Fully Extended Maturity (1)		Jan. 26, 2024	[2],[5]	Jan. 26, 2023	[3],[6]
Facility Amount		$ 1,000,000	[5]	$ 1,000,000	[6]
Repurchase agreements		$ 1,000,000	[5]	844,283	[6]
Undrawn Capacity	[6]			$ 155,717
Goldman Sachs Bank USA [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity		May 31, 2022	[7]	May 31, 2021	[8]
Fully Extended Maturity (1)		May 31, 2023	[2],[7]	May 31, 2023	[3],[8]
Facility Amount		$ 750,000	[7]	$ 750,000	[8]
Repurchase agreements		410,551	[7]	578,015	[8]
Undrawn Capacity		$ 339,449	[7]	$ 171,985	[8]
Barclays Bank PLC [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity		Dec. 20, 2022		Dec. 20, 2021
Fully Extended Maturity (1)		Dec. 20, 2025	[2]	Dec. 20, 2022	[3]
Facility Amount		$ 500,000		$ 500,000
Repurchase agreements		193,884		201,384
Undrawn Capacity		$ 306,116		$ 298,616
Deutsche Bank AG New York Branch [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity		Jun. 26, 2022		Jun. 26, 2021
Fully Extended Maturity (1)		Jun. 26, 2023	[2]	Jun. 26, 2023	[3]
Facility Amount		$ 265,000		$ 250,000
Repurchase agreements		211,372		73,721
Undrawn Capacity		$ 53,628		$ 176,279
Wells Fargo Bank NA [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity	[9]	Sep. 29, 2023
Fully Extended Maturity (1)	[2],[9]	Sep. 29, 2026
Facility Amount	[9]	$ 300,000
Repurchase agreements	[9]	285,421
Undrawn Capacity	[9]	$ 14,579
Societe General New York Branch
Repurchase Agreement Counterparty [Line Items]
Initial Maturity	[10]			Apr. 30, 2022
Fully Extended Maturity (1)	[3],[10]			Oct. 31, 2022
Facility Amount	[10]			$ 300,000
Repurchase agreements	[10]			50,000
Undrawn Capacity	[10]			$ 250,000

[1] On January 14, 2022, the facility capacity was increased to $1.5 billion.

[2] Facility maturity dates may be extended based on certain conditions being met.

[3] Facility maturity dates may be extended based on certain conditions being met

[4] This financing has a LIBOR floor of 0.25%

[5] One asset on this financing has a LIBOR floor of 1.00% and one asset has a LIBOR floor of 0.25%. On January 25, 2022, the reference rate on this facility was changed from LIBOR to SOFR, and the fully extended maturity was extended to January 26, 2025.

[6] One asset on this financing has a LIBOR floor of 1.00%

[7] This financing has a LIBOR floor of 0.35% with respect to transactions where the initial financing date was before May 27, 2021.

[8] This financing has a LIBOR floor of 0.35%.  Unless modified prior to the initial maturity date, during the period between this facility’s initial maturity date and its fully extended maturity date, the facility may not be used to finance any of the Company’s new investments and 100% of the principal repayments received from pledged loans will be applied to the outstanding balance of the facility

[9] On March 7, 2022, the facility’s capacity was increased to $750.0 million.

[10] This facility’s amount can be increased up to $500,000,000, upon the occurrence of certain events. This financing has a LIBOR floor of 1.00%