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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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