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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Receivables	$ 683		$ 683		$ 515
Property management fees
Disaggregation of Revenue [Line Items]
Income	631	$ 671	1,996	$ 2,126
Asset management fees
Disaggregation of Revenue [Line Items]
Income	269	303	831	910
Leasing commissions and other fees
Disaggregation of Revenue [Line Items]
Income	65	44	138	176
Other fee income
Disaggregation of Revenue [Line Items]
Income	$ 965	$ 1,018	$ 2,965	$ 3,212

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Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations.

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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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