Impairment of Real Estate, Impairment of Unconsolidated Entities and Write-Off of Abandoned Development Projects and Demolition Costs (Details 1) (USD $)	11 Months Ended	12 Months Ended
	Dec. 31, 2013	Jan. 31, 2013	Jan. 31, 2012
Schedule of Impairment of Real Estate Discontinued Operations [Line Items]
Impairment of real estate on discontinued operations	$ 22,519,000	$ 4,254,000	$ 13,692,000
Orchard Town Center [Member]
Schedule of Impairment of Real Estate Discontinued Operations [Line Items]
Impairment of real estate on discontinued operations	15,649,000	0	0
Kansas City, Missouri triple net lease retail property [Member]
Schedule of Impairment of Real Estate Discontinued Operations [Line Items]
Impairment of real estate on discontinued operations	6,870,000	0	0
Portgage, Michigan triple net lease retail property [Member]
Schedule of Impairment of Real Estate Discontinued Operations [Line Items]
Impairment of real estate on discontinued operations	0	2,263,000	3,435,000
White Oak Village [Member]
Schedule of Impairment of Real Estate Discontinued Operations [Line Items]
Impairment of real estate on discontinued operations	0	1,566,000	0
250 Huron [Member]
Schedule of Impairment of Real Estate Discontinued Operations [Line Items]
Impairment of real estate on discontinued operations	0	0	10,257,000
Other [Member]
Schedule of Impairment of Real Estate Discontinued Operations [Line Items]
Impairment of real estate on discontinued operations	$ 0	$ 425,000	$ 0