Notes Payable, Bank Credit Facility, Interest and Amortization of Deferred Debt Costs - Scheduled Maturities of Debt, Including Scheduled Principal Amortization (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Balloon Payments
October 1 through December 31, 2022	$ 0
2023	9,225,000
2024	50,117,000
2025	148,363,000
2026	134,088,000
2027	100,000,000
Thereafter	440,093,000
Principal amount	881,886,000
Scheduled Principal Amortization
October 1 through December 31, 2022	8,050,000
2023	32,938,000
2023	33,575,000
2024	31,437,000
2025	28,076,000
2026	23,469,000
Thereafter	171,057,000
Principal amount	328,602,000
Total
October 1 through December 31, 2022	8,050,000
2023	42,163,000
2024	83,692,000
2025	179,800,000
2026	162,164,000
2027	123,469,000
Thereafter	611,150,000
Principal amount	1,210,488,000	$ 1,200,000,000
Unamortized deferred debt costs	16,288,000	11,200,000
Net	1,194,200,000
Outstanding line of credit	125,747,000	$ 103,167,000
Line of Credit
Total
Line of credit facility, maximum borrowing capacity	525,000,000
Unsecured Revolving Credit Facility
Total
Outstanding line of credit	228,000,000
Unsecured Revolving Credit Facility | Line of Credit
Total
Outstanding line of credit	128,000,000
Term Facility | Line of Credit
Total
Line of credit facility, maximum borrowing capacity	$ 100,000,000