Fair Value Measurements (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$ 3,737,380		$ 3,737,380		$ 3,718,944
Unrealized (losses) and gains on equity securities	(5,500)	$ 1,400	(8,500)	$ 1,800
Impairment of Real Estate		$ (135)		$ (135)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities	40,746		40,746		49,513
Available-for-sale debt securities	14,439		14,439		15,599
Interest rate derivatives	3,950		3,950
Total	59,135		59,135		65,112
Interest rate derivatives					(2,858)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating properties					140,500
Impairment of Real Estate					(84,277)
Fair Value Inputs Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable, Fair Value	3,525,203		3,525,203		4,103,533
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	14,439		14,439		15,599
Interest rate derivatives	3,950		3,950
Total	18,389		18,389		15,599
Interest rate derivatives					(2,858)
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	40,746		40,746		49,513
Total	$ 40,746		$ 40,746		$ 49,513
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