Variable Interest Entities (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Sep. 30, 2018
Variable Interest Entity [Line Items]
Real estate properties, net of accumulated depreciation of $53,637 and $52,873		$ 1,029,239	$ 1,020,874
Cash and cash equivalents		32,428	27,360
Deposits and escrows		21,268	24,458
Other assets		8,084	10,080
Real estate property held for sale		0	38,928
Total Assets	[1]	1,123,707	1,153,364
Mortgages payable, net of deferred costs of $3,628 and $3,786		771,817	792,432
Accounts payable and accrued liabilities		24,487	27,409
Total Liabilities	[1]	833,347	856,879
Real estate accumulated depreciation		91,715	85,724
Deferred mortgage costs		6,646	6,735
Variable interest entity
Variable Interest Entity [Line Items]
Real estate properties, net of accumulated depreciation of $53,637 and $52,873		584,074	586,623
Cash and cash equivalents		5,207	6,699
Deposits and escrows		11,705	11,837
Other assets		6,302	6,781
Real estate property held for sale		0	38,852
Total Assets		607,288	650,792
Mortgages payable, net of deferred costs of $3,628 and $3,786		446,779	481,569
Accounts payable and accrued liabilities		11,816	12,841
Total Liabilities		458,595	494,410
Real estate accumulated depreciation		53,637	52,873
Mortgages
Variable Interest Entity [Line Items]
Deferred mortgage costs		6,289	6,373
Mortgages | Variable interest entity
Variable Interest Entity [Line Items]
Deferred mortgage costs		$ 3,628	$ 3,786

[1] The Company's consolidated balance sheets include the assets and liabilities of consolidated variable interest entities (VIEs). See note 6. The consolidated balance sheets include the following amounts related to the Company's VIEs as of December 31, 2018 and September 30, 2018, respectively: $584,074 and $586,623 of real estate properties, $5,207 and $6,699 of cash and cash equivalents, $11,705 and $11,837 of deposits and escrows, $6,302 and $6,781 of other assets, $0 and $38,928 of real estate properties held for sale, $446,749 and $481,569 of mortgages payable, net of deferred costs and $11,816 and $12,841 of accounts payable and accrued liabilities.