Financial Instruments: Derivatives and Hedging (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financial Instruments: Derivatives and Hedging
Fair Value	$ 67,060,000		$ 67,060,000		$ 57,660,000
Fair value of derivatives in a net liability position	10,800,000		10,800,000
Aggregate termination value	10,800,000		10,800,000
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months			49,200,000
Share of joint venture of accumulated other comprehensive loss reclassified into equity in net income from unconsolidated joint ventures within the next 12 months			15,100,000
Amount of Gain Recognized in Other Comprehensive (Loss) Income	56,662,000	$ 14,622,000	37,254,000	$ 53,307,000
Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income	15,340,000	(2,701,000)	26,991,000	(7,583,000)
Purchase Price Fair Value Adjustment Gross
Financial Instruments: Derivatives and Hedging
Gain (loss) from changes in fair value	400,000	0	200,000	0
Interest Expense
Financial Instruments: Derivatives and Hedging
Gain (loss) from changes in fair value	100,000	0	100,000	0
Interest Rate Contract
Financial Instruments: Derivatives and Hedging
Fair Value	57,234,000		57,234,000
Interest Rate Swap Expiring in July 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000		$ 100,000,000
Strike Rate	1.063%		1.063%
Fair Value	$ 336,000		$ 336,000
Interest Rate Swap Expiring in July 2023, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	1.033%		1.033%
Fair Value	$ 677,000		$ 677,000
Interest Rate Cap Expiring September 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 600,000,000		$ 600,000,000
Strike Rate	4.08%		4.08%
Fair Value	$ (1,413,000)		$ (1,413,000)
Interest Rate Cap Expiring September 2023, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 50,000,000		$ 50,000,000
Strike Rate	3.386%		3.386%
Fair Value	$ 219,000		$ 219,000
Interest Rate Swap Expiring in November 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	4.739%		4.739%
Fair Value	$ 402,000		$ 402,000
Interest Rate Cap Expiring November 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 196,717,000		$ 196,717,000
Strike Rate	3.50%		3.50%
Fair Value	$ 1,315,000		$ 1,315,000
Interest Rate Cap Expiring November 2023, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 196,717,000		$ 196,717,000
Strike Rate	3.50%		3.50%
Fair Value	$ (1,313,000)		$ (1,313,000)
Interest Rate Swap Expiring January 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000		$ 150,000,000
Strike Rate	2.60%		2.60%
Fair Value	$ 2,043,000		$ 2,043,000
Interest Rate Swap Expiring in January 2024, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	4.49%		4.49%
Fair Value	$ 813,000		$ 813,000
Interest Rate Swap Expiring in January 2024, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	4.411%		4.411%
Fair Value	$ 893,000		$ 893,000
Interest Rate Cap Expiring June 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000,000		$ 370,000,000
Strike Rate	3.25%		3.25%
Fair Value	$ 7,125,000		$ 7,125,000
Mezzanine Loan Due June 2023, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000,000		$ 370,000,000
Strike Rate	3.25%		3.25%
Fair Value	$ (7,100,000)		$ (7,100,000)
Interest Rate Swap Expiring January 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000		$ 150,000,000
Strike Rate	2.621%		2.621%
Fair Value	$ 6,549,000		$ 6,549,000
Interest Rate Swap Expiring January 2026, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	2.662%		2.662%
Fair Value	$ 8,587,000		$ 8,587,000
Interest Rate Swap Expiring in February 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000		$ 100,000,000
Strike Rate	2.903%		2.903%
Fair Value	$ 4,055,000		$ 4,055,000
Interest Rate Swap Expiring in February 2027, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000		$ 100,000,000
Strike Rate	2.733%		2.733%
Fair Value	$ 4,619,000		$ 4,619,000
Interest Rate Swap Expiring in February 2027, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 50,000,000		$ 50,000,000
Strike Rate	2.463%		2.463%
Fair Value	$ 2,758,000		$ 2,758,000
Interest Rate Swap Expiring in February 2027, 4
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	2.591%		2.591%
Fair Value	$ 10,184,000		$ 10,184,000
Interest Rate Swap Expiring in May 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 300,000,000		$ 300,000,000
Strike Rate	2.866%		2.866%
Fair Value	$ 12,153,000		$ 12,153,000
Interest Rate Swap Expiring in May 2027, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000		$ 150,000,000
Strike Rate	3.524%		3.524%
Fair Value	$ 1,497,000		$ 1,497,000
Interest Rate Swap Expiring in June 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000,000		$ 370,000,000
Strike Rate	3.888%		3.888%
Fair Value	$ 2,051,000		$ 2,051,000
Interest Rate Swap Expiring in January 2028
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000		$ 100,000,000
Strike Rate	3.756%		3.756%
Fair Value	$ 784,000		$ 784,000
Interest Rate Swaps/Caps
Financial Instruments: Derivatives and Hedging
Amount of Gain Recognized in Other Comprehensive (Loss) Income	45,626,000	11,333,000	27,713,000	39,711,000
Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income	10,598,000	(1,868,000)	19,621,000	(5,734,000)
Joint venture
Financial Instruments: Derivatives and Hedging
Amount of Gain Recognized in Other Comprehensive (Loss) Income	11,036,000	3,289,000	9,541,000	13,596,000
Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income	4,742,000	$ (833,000)	7,370,000	$ (1,849,000)
Joint venture | Interest Rate Contract
Financial Instruments: Derivatives and Hedging
Fair Value	76,895,000		76,895,000
Joint venture | Interest Rate Cap Expiring September 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 444,711,000		$ 444,711,000
Strike Rate	3.50%		3.50%
Fair Value	$ 1,588,000		$ 1,588,000
Joint venture | Interest Rate Cap Expiring September 2023, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 1,075,000,000		$ 1,075,000,000
Strike Rate	4.08%		4.08%
Fair Value	$ 2,461,000		$ 2,461,000
Joint venture | Interest Rate Cap Expiring June 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 505,412,000		$ 505,412,000
Strike Rate	3.00%		3.00%
Fair Value	$ 10,966,000		$ 10,966,000
Joint venture | Interest Rate Cap Expiring August 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 272,000,000		$ 272,000,000
Strike Rate	4.00%		4.00%
Fair Value	$ 338,000		$ 338,000
Joint venture | Interest Rate Cap Expiring September 2023, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 125,000,000		$ 125,000,000
Strike Rate	4.08%		4.08%
Fair Value	$ 286,000		$ 286,000
Joint venture | Interest Rate Cap Expiring February 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 220,000,000		$ 220,000,000
Strike Rate	4.00%		4.00%
Fair Value	$ 1,784,000		$ 1,784,000
Joint venture | Interest Rate Cap Expiring May 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 378,467,000		$ 378,467,000
Strike Rate	0.49%		0.49%
Fair Value	$ 18,340,000		$ 18,340,000
Joint venture | Interest Rate Cap Expiring May 2024, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 378,467,000		$ 378,467,000
Strike Rate	0.49%		0.49%
Fair Value	$ 18,339,000		$ 18,339,000
Joint venture | Interest Rate Swap Expiring February 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 250,000,000		$ 250,000,000
Strike Rate	3.608%		3.608%
Fair Value	$ 5,095,000		$ 5,095,000
Joint venture | Interest Rate Swap Expiring February 2026, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 250,000,000		$ 250,000,000
Strike Rate	3.608%		3.608%
Fair Value	$ 5,095,000		$ 5,095,000
Joint venture | Interest Rate Swap Expiring February 2026, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 177,000,000		$ 177,000,000
Strike Rate	1.555%		1.555%
Fair Value	$ 12,603,000		$ 12,603,000