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Related Party Transactions and Investments in Non-Consolidated Entities - Equity in losses of investment in non-consolidated REITs (Details) - USD ($)						1 Months Ended		3 Months Ended	6 Months Ended
	Apr. 03, 2019	Sep. 27, 2018	Sep. 24, 2018	Aug. 17, 2018	Jul. 19, 2018	May 31, 2009	Dec. 31, 2007	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Sponsored REITs
Equity in loss of non-consolidated REITs								$ (282,000)	$ (387,000)
Impairment charge									(309,000)
Distributions received from non-consolidated REITs
Equity Method Investment Distribution in Excess of Earnings									710,000
East Wacker
Sponsored REITs
Equity in loss of non-consolidated REITs									(26,000)
Preferred shares purchased							965.75
Percentage of outstanding preferred shares purchased							43.70%
Liquidating distribution receivable			$ 70,000,000
Gain (loss) on liquidation			$ 7,100,000
Amount received	$ 1,000,000	$ 69,000,000
Grand Boulevard
Sponsored REITs
Equity in loss of non-consolidated REITs									$ (52,000)
Preferred shares purchased						175.5
Percentage of outstanding preferred shares purchased						27.00%
Liquidating distribution receivable					$ 6,200,000
Gain (loss) on liquidation					$ (100,000)
Amount received				$ 5,900,000
Beneficial interest										$ 100,000

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