Derivative Financial Instruments - Floating-to-Fixed Interest Rate Swaps (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jul. 06, 2023	Jul. 05, 2023	Apr. 03, 2023	Dec. 31, 2022	Sep. 01, 2022	Jul. 05, 2022	Nov. 01, 2020
Derivative [Line Items]
Notional Amount	$ 1,475,317				$ 1,288,349
Interest rate swaps
Derivative [Line Items]
Notional Amount	1,298,753
Interest rate swaps | Secured Overnight Financing Rate (SOFR) | Minimum
Derivative [Line Items]
Rate corridor, terminated		1.00%	1.00%
Interest rate swaps | Secured Overnight Financing Rate (SOFR) | Maximum
Derivative [Line Items]
Rate corridor, terminated		3.00%	3.00%
Interest rate caps
Derivative [Line Items]
Notional Amount	176,564
Interest rate caps | Bloomberg Short Term Bank Yield Index (BSBY)
Derivative [Line Items]
Notional amount, terminated				$ 175,000
Interest rate cap, terminated				4.00%
Interest rate caps | Bloomberg Short Term Bank Yield Index (BSBY) | Minimum
Derivative [Line Items]
Rate corridor, terminated				1.00%
Interest rate caps | Bloomberg Short Term Bank Yield Index (BSBY) | Maximum
Derivative [Line Items]
Rate corridor, terminated				3.00%
Floating rate pool of loans 3.40% | Interest rate swaps | Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Notional amount, terminated		$ 50,000
Floating rate pool of loans 3.39% | Interest rate swaps | Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Notional amount, terminated			$ 200,000
Derivatives designated as accounting hedges | Interest rate swaps
Derivative [Line Items]
Notional Amount	678,753				187,670
Derivatives designated as accounting hedges | Interest rate caps
Derivative [Line Items]
Notional Amount	176,564				561,200
Derivatives designated as accounting hedges | Interest rate caps | Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Notional Amount	73,600					$ 57,089	$ 35,100	$ 84,375
Derivatives designated as accounting hedges | Senior unsecured term loan | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 10,500
Swap Fixed Rate	2.94%
Debt effective rate	4.34%
Derivatives designated as accounting hedges | Floating rate pool of loans 3.40% | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 50,000
Swap Fixed Rate	3.40%
Debt effective rate	4.91%
Derivatives designated as accounting hedges | Constellation Energy Building | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 175,000
Swap Fixed Rate	1.84%
Debt effective rate	3.46%
Derivatives designated as accounting hedges | Floating rate pool of loans 3.39% | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 200,000
Swap Fixed Rate	3.39%
Debt effective rate	4.90%
Derivatives designated as accounting hedges | Senior Unsecured Term Loan 0.42% | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 25,000
Swap Fixed Rate	0.42%
Debt effective rate	1.82%
Derivatives designated as accounting hedges | Senior Unsecured Term Loan 0.33% | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 25,000
Swap Fixed Rate	0.33%
Debt effective rate	1.73%
Derivatives designated as accounting hedges | Senior Unsecured Term Loan 0.44% | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 25,000
Swap Fixed Rate	0.44%
Debt effective rate	1.84%
Derivatives designated as accounting hedges | Thames Street Wharf | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 68,253
Swap Fixed Rate	0.93%
Debt effective rate	2.33%
Derivatives designated as accounting hedges | M&T unsecured term loan | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 100,000
Swap Fixed Rate	3.50%
Debt effective rate	4.90%
Derivatives not designated as accounting hedges
Derivative [Line Items]
Notional Amount	$ 620,000				539,479
Derivatives not designated as accounting hedges | Interest rate swaps
Derivative [Line Items]
Notional Amount	620,000				250,000
Derivatives not designated as accounting hedges | Interest rate caps
Derivative [Line Items]
Notional Amount	0				$ 289,479
Derivatives not designated as accounting hedges | Harbor Point Parcel 3 senior construction loan 4.70% | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 90,000
Swap Fixed Rate	2.75%
Debt effective rate	4.82%
Notional amount, terminated	$ 180,400
Amount paid to buy down the swap fixed rate	3,600
Derivatives not designated as accounting hedges | Floating rate pool of loans 2.75% | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 330,000
Swap Fixed Rate	2.75%
Debt effective rate	4.26%
Amount paid to buy down the swap fixed rate	$ 13,300
Derivatives not designated as accounting hedges | Revolving credit facility and TD unsecured term loan | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 100,000
Swap Fixed Rate	3.20%
Debt effective rate	4.70%
Derivatives not designated as accounting hedges | Senior Unsecured Term Loan 3.43% | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 100,000
Swap Fixed Rate	3.43%
Debt effective rate	4.83%