Debt - Credit Facility (Details) $ in Thousands	1 Months Ended		3 Months Ended	6 Months Ended
	Apr. 30, 2022 USD ($)	Jun. 30, 2021 USD ($) Options	Jun. 30, 2022 USD ($) agreement loan instrument	Jun. 30, 2022 USD ($) agreement loan instrument	Dec. 31, 2021 USD ($)
Credit facilities
Borrowings outstanding (in dollars)			$ 45,000	$ 45,000	$ 130,000
Unamortized financing costs related to all debt			14,373	14,373	12,447
Consolidated special purpose entities
Credit facilities
Unamortized financing costs related to all debt			22,470	22,470	25,583
Revolving credit facility
Credit facilities
Unamortized financing costs related to all debt			3,200	$ 3,200	$ 3,700
Senior Unsecured Notes
Unsecured Term Notes Payable
Contingent periodic interest rate increase for failure to maintain investment grade credit rating				1.00%
Prepayment applied to principal plus make-whole amount (as a percent)				100.00%
Principal amount			$ 375,000	$ 375,000
Number of loans | loan			3	3
Senior Unsecured Notes | Minimum
Unsecured Term Notes Payable
Prepayment threshold (as a percent)				5.00%
Interest rate swaps
Credit facilities
Number of agreements | instrument			7	7
New unsecured credit facility | Revolving credit facility
Credit facilities
Eligible unencumbered assets (in dollars)			$ 7,600,000	$ 7,600,000
Amended unsecured revolving credit facility | Revolving credit facility
Credit facilities
Unsecured loan facility		$ 600,000
Size of the facility with the accordion feature (in dollars)		$ 1,600,000
Number of extension options | Options		2
Maturity date		Jun. 01, 2025
Extension option term		6 months
Extension fee (as a percent)		0.0625%
Borrowings outstanding (in dollars)			$ 45,000	$ 45,000
Amended unsecured revolving credit facility | Revolving credit facility | Minimum
Credit facilities
Facility fee (as a percent)		0.10%
Amended unsecured revolving credit facility | Revolving credit facility | Maximum
Credit facilities
Facility fee (as a percent)		0.30%		0.30%
Amended unsecured revolving credit facility | Revolving credit facility | LIBOR
Credit facilities
Debt Instrument interest rate description		LIBOR
Credit spread (as a percent)				0.85%
Facility fee (as a percent)				0.20%
Amended unsecured revolving credit facility | Revolving credit facility | LIBOR | Minimum
Credit facilities
Credit spread (as a percent)		0.70%
Amended unsecured revolving credit facility | Revolving credit facility | LIBOR | Maximum
Credit facilities
Credit spread (as a percent)		1.40%
Amended unsecured revolving credit facility | Revolving credit facility | Base rate
Credit facilities
Debt Instrument interest rate description		Base Rate
Amended unsecured revolving credit facility | Revolving credit facility | Base rate | Minimum
Credit facilities
Credit spread (as a percent)		0.00%
Amended unsecured revolving credit facility | Revolving credit facility | Base rate | Maximum
Credit facilities
Credit spread (as a percent)		0.40%
Amended unsecured revolving credit facility | Senior Unsecured Notes
Credit facilities
Accordion feature		$ 1,000,000
Unsecured Term Loan
Unsecured Term Notes Payable
Principal amount	$ 600,000
Fixed rate	3.68%
Unsecured Term Loan | Secured Overnight Financing Rate (SOFR) [Member]
Credit facilities
Adjustment to floating rate	0.10%
Unsecured Five Year Term Loan
Credit facilities
Number of agreements | agreement			6	6
Effective fixed rate			3.58%	3.58%
Unsecured Term Notes Payable
Principal amount	$ 400,000
Initial term	5 years		5 years
Unsecured Five Year Term Loan | Secured Overnight Financing Rate (SOFR) [Member]
Credit facilities
Adjustment to floating rate				0.10%
Credit spread (as a percent)			0.95%	0.95%
Unsecured Five Year Term Loan | Secured Overnight Financing Rate (SOFR) [Member] | Minimum
Credit facilities
Credit spread (as a percent)	0.75%
Unsecured Five Year Term Loan | Secured Overnight Financing Rate (SOFR) [Member] | Maximum
Credit facilities
Credit spread (as a percent)	1.60%
Unsecured Seven Year Term Loan
Credit facilities
Number of agreements | agreement			1	1
Effective fixed rate			3.88%	3.88%
Unsecured Term Notes Payable
Principal amount	$ 200,000
Initial term	7 years		7 years
Prepayment premium, percentage, year one	2.00%
Payment premium, percentage, year two	1.00%
Unsecured Seven Year Term Loan | Secured Overnight Financing Rate (SOFR) [Member]
Credit facilities
Adjustment to floating rate				0.10%
Credit spread (as a percent)			1.25%	1.25%
Unsecured Seven Year Term Loan | Secured Overnight Financing Rate (SOFR) [Member] | Minimum
Credit facilities
Credit spread (as a percent)	1.25%
Unsecured Seven Year Term Loan | Secured Overnight Financing Rate (SOFR) [Member] | Maximum
Credit facilities
Credit spread (as a percent)	2.20%