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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
--- | --- | --- | --- | ---
May 29, 2009 | Dec. 27, 2007 | May 31, 2009 | Dec. 31, 2007 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Sponsored REITs |  |  |  |  |  |  |
Equity in losses of non-consolidated REITs |  |  |  |  | $ 3,604,000 | $ 831,000 | $ 1,451,000
Impairment charge |  |  |  |  | 2,519,000 |  |
Distributions received from non-consolidated REITs |  |  |  |  |  |  |
Distributions from non-consolidated REITs |  |  |  |  | 1,396,000 | 1,023,000 | 107,000
East Wacker |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |
Equity in losses of non-consolidated REITs |  |  |  |  | 428,000 | 563,000 | 1,352,000
Preferred shares purchased |  | 965.75 |  | 965.75 |  |  |
Percentage of outstanding preferred shares purchased |  | 43.70% |  | 43.70% |  |  |
Net cost of preferred shares purchased |  | $ 82,813,000 |  | $ 82,813,000 |  |  |
Offering price of preferred shares purchased |  |  |  | 96,575,000 |  |  |
Commissions excluded |  |  |  | 7,726,000 |  |  |
Loan fees excluded |  |  |  | 5,553,000 |  |  |
Acquisition fees excluded |  |  |  | $ 483,000 |  |  |
Distributions received from non-consolidated REITs |  |  |  |  |  |  |
Distributions from non-consolidated REITs |  |  |  |  | 1,289,000 | 916,000 |
Grand Boulevard |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |
Equity in losses of non-consolidated REITs |  |  |  |  | 657,000 | 268,000 | 99,000
Preferred shares purchased | 175.5 |  | 175.5 |  |  |  |
Percentage of outstanding preferred shares purchased | 27.00% |  | 27.00% |  |  |  |
Net cost of preferred shares purchased | $ 15,049,000 |  | $ 15,049,000 |  |  |  |
Offering price of preferred shares purchased |  |  | 17,550,000 |  |  |  |
Commissions excluded |  |  | 1,404,000 |  |  |  |
Loan fees excluded |  |  | 1,009,000 |  |  |  |
Acquisition fees excluded |  |  | $ 88,000 |  |  |  |
Distributions received from non-consolidated REITs |  |  |  |  |  |  |
Distributions from non-consolidated REITs |  |  |  |  | $ 107,000 | $ 107,000 | $ 107,000

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