Property Transactions Property Transactions (Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Discontinued Operations [Line Items]
Document Fiscal Year Focus			2014
Income (Loss) from Discontinued Operations	$ 566	$ 687	$ 1,457	$ 1,470
Gain (Loss) on Disposal of Discontinued Operation	14	86	6,379	204
Segment, Discontinued Operations [Member]
Discontinued Operations [Line Items]
Rental property revenues	967	2,940	2,323	5,940
Fee Income	0	3	0	77
Other Income	8	8	15	15
Rental property operating expenses	(402)	(1,182)	(866)	(2,373)
General and Administrative Expense	(1)	(27)	(2)	(79)
Depreciation and amortization	0	(1,046)	0	(2,097)
Discontinued Operations Other Expense	(6)	(9)	(13)	(13)
Income (Loss) from Discontinued Operations	566	687	1,457	1,470
Six Hundred University Park Place Birmingham [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	0	0	6,371	0
King Mill Distribution Park Building Three [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	0	89	0	208
Other Discontinued Operations [Member]
Discontinued Operations [Line Items]
Gain (Loss) on Disposal of Discontinued Operation	$ 14	$ (3)	$ 8	$ (4)