Notes and Bonds Payable - Mortgage Notes (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Issuance costs	$ (9,245,000)
Notes and bonds payable	1,801,325,000	$ 1,602,769,000
Mortgage Notes Payable | Mortgage Notes
Debt Instrument [Line Items]
Mortgage notes	103,664,000	117,221,000
Unamortized premium	1,720,000	1,450,000
Unaccreted discount	(83,000)	(150,000)
Issuance costs	(651,000)	(758,000)
Notes and bonds payable	$ 104,650,000	$ 117,763,000