Indebtedness - Summary of Mortgage Notes Payable (Details) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Secured Debt	$ 2,382,652
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.54%
average maturity mortgage debt	8 years 1 month 6 days
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Accumulated Amortization Adjustment	$ (35,400)
Mark-to-Market debt	(3,888)
Long-term Debt	2,343,364
Fixed Income Interest Rate [Member]
Debt Instrument [Line Items]
Secured Debt	$ 2,290,402
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.60%
average maturity mortgage debt	8 years 3 months 18 days
Variable Income Interest Rate [Member]
Debt Instrument [Line Items]
Secured Debt	$ 92,250
Long-term Debt, Weighted Average Interest Rate, at Point in Time	2.02%
average maturity mortgage debt	3 years 2 months 12 days
Residential Properties
Debt Instrument [Line Items]
Secured Debt	$ 1,625,745
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.32%
average maturity mortgage debt	7 years 10 months 24 days
Residential Properties \| Fixed Income Interest Rate [Member]
Debt Instrument [Line Items]
Secured Debt	$ 1,553,245
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.39%
average maturity mortgage debt	8 years 1 month 6 days
Residential Properties \| Variable Income Interest Rate [Member]
Debt Instrument [Line Items]
Secured Debt	$ 72,500
Long-term Debt, Weighted Average Interest Rate, at Point in Time	1.98%
average maturity mortgage debt	2 years 9 months 18 days
New Market Properties [Member]
Debt Instrument [Line Items]
Secured Debt	$ 592,401
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.90%
average maturity mortgage debt	6 years 3 months 18 days
New Market Properties [Member] \| Fixed Income Interest Rate [Member]
Debt Instrument [Line Items]
Secured Debt	$ 572,651
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.96%
average maturity mortgage debt	6 years 4 months 24 days
New Market Properties [Member] \| Variable Income Interest Rate [Member]
Debt Instrument [Line Items]
Secured Debt	$ 19,750
Long-term Debt, Weighted Average Interest Rate, at Point in Time	2.16%
average maturity mortgage debt	4 years 7 months 6 days
Preferred Office Properties [Member]
Debt Instrument [Line Items]
Secured Debt	$ 164,506
Long-term Debt, Weighted Average Interest Rate, at Point in Time	4.35%
average maturity mortgage debt	16 years 1 month 6 days
Preferred Office Properties [Member] \| Fixed Income Interest Rate [Member]
Debt Instrument [Line Items]
Secured Debt	$ 164,506
Long-term Debt, Weighted Average Interest Rate, at Point in Time	4.35%
average maturity mortgage debt	16 years 1 month 6 days

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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