Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$ 3,711,784		$ 3,726,754
Unsecured credit facilities	30,000
Trading securities, unrealized holding gain (loss)	1,600	$ (3,000)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities	38,788		40,089
Available-for-sale debt securities	15,179		14,492
Interest rate derivatives	4,907		6,575
Total	58,874		61,156
Interest rate derivatives	(370)
Fair Value Inputs Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable, Fair Value	3,409,128		3,333,378
Unsecured credit facilities, Fair Value	30,000
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	15,179		14,492
Interest rate derivatives	4,907		6,575
Total	20,086		21,067
Interest rate derivatives	(370)
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	38,788		40,089
Total	$ 38,788		$ 40,089