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Related Party Transactions and Investments in Non-Consolidated Entities - Equity in losses of investment in non-consolidated REITs (Details) - USD ($) $ in Thousands							1 Months Ended		12 Months Ended
	Sep. 27, 2018	Sep. 24, 2018	Aug. 17, 2018	Jul. 19, 2018	May 29, 2009	Dec. 27, 2007	May 31, 2009	Dec. 31, 2007	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Sponsored REITs
Equity in income (loss) of non-consolidated REITs									$ 6,793	$ (3,604)	$ (831)
Impairment charge									(309)	(2,519)
Amount received									74,931
Distributions received from non-consolidated REITs
Distributions from non-consolidated REITs									710	1,396	1,023
Equity Method Investment Distribution in Excess of Earnings									710	1,396	1,023
East Wacker
Sponsored REITs
Equity in income (loss) of non-consolidated REITs									7,209	(428)	(563)
Preferred shares purchased						965.75		965.75
Percentage of outstanding preferred shares purchased						43.70%		43.70%
Liquidating distribution receivable		$ 70,000
Gain (loss) on liquidation		$ 7,100
Amount received	$ 69,000
Beneficial interest									1,000
Distributions received from non-consolidated REITs
Distributions from non-consolidated REITs									657	1,289	916
Grand Boulevard
Sponsored REITs
Equity in income (loss) of non-consolidated REITs									(107)	(657)	(268)
Preferred shares purchased					175.5		175.5
Percentage of outstanding preferred shares purchased					27.00%		27.00%
Liquidating distribution receivable				$ 6,200
Gain (loss) on liquidation				$ (100)
Amount received			$ 5,900
Beneficial interest									300
Distributions received from non-consolidated REITs
Distributions from non-consolidated REITs									$ 53	$ 107	$ 107

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