Property Transactions Property Transactions (Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Discontinued Operations [Line Items]
Document Fiscal Year Focus	2014
Income (Loss) from Discontinued Operations	$ 892	$ 778
Gain (Loss) on Disposal of Discontinued Operation	6,365	118
Segment, Discontinued Operations [Member]
Discontinued Operations [Line Items]
Rental property revenues	1,356	3,000
Fee Income	0	74
Other Income	7	7
Rental property operating expenses	(464)	(1,194)
Reimbursed Expenses	0	0
General and Administrative Expense	(1)	(52)
Depreciation and amortization	0	(1,053)
Discontinued Operations Other Expense	(6)	(4)
Income (Loss) from Discontinued Operations	892	778
Six Hundred University Park Place Birmingham [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	6,371	0
King Mill Distribution Park Building Three [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	0	119
Other Discontinued Operations [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	$ (6)	$ (1)