Investment in Unconsolidated Ventures - Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
ASSETS
Carry value of investment property	$ 168,451	$ 169,689
Cash and cash equivalents	18,707	22,699
Other assets	7,613	7,282
Total Assets	394,960	390,610
Liabilities:
Mortgages payable	132,524	133,215
Accounts payable and accrued liabilities	22,642	20,772
Total Liabilities	192,234	191,050
Commitments and contingencies
Equity [Abstract]
Total unconsolidated joint venture equity	202,879	199,653
Total Liabilities and Equity	394,960	390,610
Deferred mortgage costs	1,090	1,160
Mortgages payable
Equity [Abstract]
Deferred mortgage costs	758	823
Unconsolidated joint ventures
ASSETS
Carry value of investment property	1,102,025	1,070,941
Cash and cash equivalents	12,717	12,804
Deposits and escrows	20,061	23,912
Other assets	4,791	4,136
Total Assets	1,139,594	1,111,793
Liabilities:
Mortgages payable	826,646	803,289
Accounts payable and accrued liabilities	15,438	19,731
Total Liabilities	842,084	823,020
Equity [Abstract]
Total unconsolidated joint venture equity	297,510	288,773
Total Liabilities and Equity	1,139,594	1,111,793
Investment in unconsolidated joint ventures	185,946	177,071
Real estate properties, net of accumulated depreciation	114,358	104,001
Unconsolidated joint ventures | Mortgages payable
Equity [Abstract]
Deferred mortgage costs	$ 5,847	$ 5,839