Fair Value Measurements (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$ 3,729,404,000		$ 3,729,404,000		$ 3,718,944,000
Unrealized (losses) and gains on equity securities	(1,000,000.0)	$ 1,500,000	(9,500,000)	$ 217,000
Impairment of Real Estate		$ 20,000		$ (115,000)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities	38,848,000		38,848,000		49,513,000
Available-for-sale debt securities	14,129,000		14,129,000		15,599,000
Interest rate derivatives	7,146,000		7,146,000
Total	60,123,000		60,123,000		65,112,000
Interest rate derivatives					(2,858,000)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating properties					140,500,000
Impairment of Real Estate					(84,277,000)
Fair Value Inputs Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable, Fair Value	3,338,134,000		3,338,134,000		4,103,533,000
Fair Value Inputs Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	14,129,000		14,129,000		15,599,000
Interest rate derivatives	7,146,000		7,146,000
Total	21,275,000		21,275,000		15,599,000
Interest rate derivatives					(2,858,000)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities	38,848,000		38,848,000		49,513,000
Total	$ 38,848,000		$ 38,848,000		$ 49,513,000
Fair Value, Inputs, Level 3 [Member] | Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investment Rate					0.072
Fair Value, Inputs, Level 3 [Member] | Terminal Capitalization Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investment Rate					0.0525
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating properties					$ 140,500,000