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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 | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2019 | Feb. 02, 2019 | 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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Sponsored REITs |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in income (loss) |  |  |  |  |  |  |  |  |  |  |  | $ 6,793,000 | $ (3,604,000)
Impairment charge |  |  |  |  |  |  |  |  |  |  |  | (309,000) | (2,519,000)
Proceeds received from liquidating trust |  |  |  |  |  |  |  |  |  |  | $ 1,470,000 |  |
Amount received |  |  |  |  |  |  |  |  |  |  |  | 74,931,000 |
Distributions received from non-consolidated REITs |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions from non-consolidated REITs |  |  |  |  |  |  |  |  |  |  |  | 710,000 | 1,396,000
East Wacker |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in income (loss) |  |  |  |  |  |  |  |  |  |  |  | 7,209,000 | (428,000)
Preferred shares purchased |  |  |  |  |  |  |  | 965.75 |  | 965.75 |  |  |
Percentage of outstanding preferred shares purchased |  |  |  |  |  |  |  | 43.70% |  | 43.70% |  |  |
Liquidating distribution receivable |  |  |  | $ 70,000,000.0 |  |  |  |  |  |  |  |  |
Gain (loss) on liquidation |  |  |  | $ 7,100,000 |  |  |  |  |  |  |  |  |
Proceeds received from liquidating trust | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount received |  |  | $ 69,000,000.0 |  |  |  |  |  |  |  |  |  |
Distributions received from non-consolidated REITs |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions from non-consolidated REITs |  |  |  |  |  |  |  |  |  |  |  | 657,000 | 1,289,000
Grand Boulevard |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in income (loss) |  |  |  |  |  |  |  |  |  |  |  | (107,000) | (657,000)
Preferred shares purchased |  |  |  |  |  |  | 175.5 |  | 175.5 |  |  |  |
Percentage of outstanding preferred shares purchased |  |  |  |  |  |  | 27.00% |  | 27.00% |  |  |  |
Liquidating distribution receivable |  |  |  |  |  | $ 6,200,000 |  |  |  |  |  |  |
Gain (loss) on liquidation |  |  |  |  |  | $ (100,000) |  |  |  |  |  |  |
Proceeds received from liquidating trust |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |
Amount received |  |  |  |  | $ 5,900,000 |  |  |  |  |  |  |  |
Beneficial interest |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |
Distributions received from non-consolidated REITs |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions from non-consolidated REITs |  |  |  |  |  |  |  |  |  |  |  | $ 53,000 | $ 107,000

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