Fair Value Measurements (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$ 3,716,717,000		$ 3,718,944,000
Unrealized (losses) and gains	(3,000,000.0)	$ 417,462
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities	46,358,000		49,513,000
Available-for-sale debt securities	14,974,000		15,599,000
Interest rate derivatives	1,242,000
Total	62,574,000		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	3,782,877,000		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	14,974,000		15,599,000
Interest rate derivatives	1,242,000
Total	16,216,000		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	46,358,000		49,513,000
Total	$ 46,358,000		$ 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