Investment in Unconsolidated Affiliates - Summary of financial position (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Real estate investments	$ 921,659			$ 896,702
Accumulated depreciation	(191,016)			(179,155)
Total real estate investments, net	730,643			717,547
Cash and cash equivalents	20,464			51,507	$ 22,168
Restricted deposits	9,267			9,149	10,879
Intangible assets, less accumulated amortization	5,556			6,246
Other assets, net	25,868			10,302
Total Assets	867,785			820,866
LIABILITIES
Mortgage notes payable, net	511,990			493,142
Tenant security deposits payable	6,305			5,225
Accrued expenses and other liabilities	14,778			18,604
Total Liabilities	542,208			525,349
SHAREHOLDERS' EQUITY
Total Shareholders' Equity	325,577	$ 314,224	$ 309,537	295,517	$ 296,916	$ 295,043	$ 293,859	$ 291,528
Total liabilities and shareholders' equity	867,785			820,866
Unconsolidated Affiliates
ASSETS
Real estate investments	202,492			134,839
Accumulated depreciation	(15,158)			(10,940)
Total real estate investments, net	187,334			123,899
Cash and cash equivalents	2,054			1,131
Restricted deposits	856			650
Intangible assets, less accumulated amortization	349			41
Other assets, net	740			909
Total Assets	191,333			126,630
LIABILITIES
Mortgage notes payable, net	139,087			87,996
Tenant security deposits payable	192			108
Accrued expenses and other liabilities	10,415			8,029
Total Liabilities	149,694			96,133
SHAREHOLDERS' EQUITY
Total Shareholders' Equity	41,639			30,497
Total liabilities and shareholders' equity	$ 191,333			$ 126,630