Property Transactions Property Transactions (Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Discontinued Operations [Line Items]
Document Fiscal Year Focus			2014
Income (Loss) from Discontinued Operations	$ 348	$ 1,257	$ 1,806	$ 2,724
Gain (Loss) on Disposal of Discontinued Operation	12,993	8,346	19,372	8,550
Segment, Discontinued Operations [Member]
Discontinued Operations [Line Items]
Rental property revenues	601	2,870	2,923	8,811
Fee Income	0	0	0	76
Other Income	14	18	29	33
Rental property operating expenses	(260)	(1,118)	(1,125)	(3,493)
General and Administrative Expense	(1)	(15)	(2)	(94)
Depreciation and amortization	0	(492)	0	(2,590)
Discontinued Operations Other Expense	(6)	(6)	(19)	(19)
Income (Loss) from Discontinued Operations	348	1,257	1,806	2,724
Lakeshore Park Plaza Birmingham [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	13,025	0	13,025	0
Six Hundred University Park Place Birmingham [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	(37)	0	6,334	0
Third Party Management [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	0	4,531	0	4,531
Tiffany Springs MarketCenter Kansas City [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	0	3,715	0	3,715
King Mill Distribution Park Building Three [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	0	38	0	246
Other Discontinued Operations [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	$ 5	$ 62	$ 13	$ 58