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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
	Sep. 27, 2018	Sep. 24, 2018	Aug. 07, 2018	Jul. 19, 2018	May 31, 2009	Dec. 31, 2007	Mar. 31, 2018	Mar. 31, 2019
Sponsored REITs
Equity in loss of non-consolidated REITs							$ (105,000)
Distributions received from non-consolidated REITs
Equity Method Investment Distribution in Excess of Earnings							355,000
East Wacker
Sponsored REITs
Equity in loss of non-consolidated REITs							77,000
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	$ 69,000,000
Beneficial interest								$ 1,000,000
Grand Boulevard
Sponsored REITs
Equity in loss of non-consolidated REITs							$ 28,000
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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