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Significant Accounting Policies - Basis, Estimates and Inv in non-consolidated REITs (Details) |  |  | 1 Months Ended |
--- | --- | --- | --- | ---
May. 29, 2009 USD ($) shares | Dec. 27, 2007 USD ($) shares | May. 31, 2009 USD ($) shares | Dec. 31, 2007 USD ($) shares | Sep. 30, 2006 shares | Dec. 31, 2015 USD ($) entity
Significant Accounting Policies |  |  |  |  |  |
Number of corporations organized to operate as real estate investment trusts (REITs) | entity |  |  |  |  |  | 9
Number of REITs in which the entity holds non-controlling preferred stock interest | entity |  |  |  |  |  | 2
Required investment balance for recognition of distributions received as income | $ |  |  |  |  |  | $ 0
Phoenix Tower |  |  |  |  |  |
Investment in Sponsored REITs |  |  |  |  |  |
Preferred shares purchased | shares |  |  |  |  | 48 |
Percentage of outstanding preferred shares purchased |  |  |  |  | 4.60% |
East Wacker |  |  |  |  |  |
Investment in Sponsored REITs |  |  |  |  |  |
Preferred shares purchased | shares |  | 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 |  |
Grand Boulevard |  |  |  |  |  |
Investment in Sponsored REITs |  |  |  |  |  |
Preferred shares purchased | shares | 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 |  |  |

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