Accounting Policies Accounting Policies (Details Textual 2) (USD $)	9 Months Ended			9 Months Ended	1 Months Ended			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Aug. 01, 2006 property	Sep. 30, 2014 Common stock Class A [Member]	Jun. 30, 2014 BCR exchange transaction [Member]	Jun. 30, 2014 BCR exchange transaction [Member] Common stock Class A [Member]	Jan. 02, 2014 BCR transaction [Member] project	Sep. 30, 2014 Noncontrolling Interest [Member]	Sep. 30, 2014 Additional Paid-in Capital [Member]
Related Party Transaction [Line Items]
Number of retail, office and residential operating properties and service companies			30
Exchange of common units for shares, units exchanged					673,565
Exchange of common units for shares, shares issued				673,000		673,565
Exchange of Class A Common Units, purchase of noncontrolling interests	$ 0			$ 224,000				$ (34,358,000)	$ 34,134,000
Class A Common Units outstanding	2,973,190	3,646,755
Costs of interest transferred to affiliates of the Company							14,286,000
Number of projects							3
Tax indemnity payment accrual	1,646,000
Tax indemnity payment	$ 1,235,000