Property Dispositions, Assets Held for Sale, and Discontinued Operations (Discontinued Operations) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Apr. 30, 2014	Mar. 19, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(loss) on sale of real estate assets			$ (2)	$ 0	$ (2)	$ 1,198
Net Sales Proceeds					151,564	46,240
Revenues:
Rental income			19	0	19	1,365
Tenant reimbursements			0	12	(3)	126
Property management fee revenue			0	0	0	1
Revenue			19	12	16	1,492
Expenses:
Property operating costs			3	3	2	185
Depreciation			0	0	0	83
Amortization			0	0	0	223
General and administrative			0	(7)	1	(1)
Expenses			3	(4)	3	490
Other income/(expense)
Other income/(expense)			0	0	0	(6)
Operating income, excluding gain on sale			16	16	13	996
Gain/(loss) on sale of real estate assets			(2)	0	(2)	1,198
Income from discontinued operations			$ 14	$ 16	$ 11	$ 2,194
11107 and 11109 Sunset Hills Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(loss) on sale of real estate assets		$ (102)
Net Sales Proceeds		22,326
Other income/(expense)
Gain/(loss) on sale of real estate assets		$ (102)
1441 West Long Lake Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(loss) on sale of real estate assets	$ 562
Net Sales Proceeds	7,202
Other income/(expense)
Gain/(loss) on sale of real estate assets	562
4685 Investment Drive [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(loss) on sale of real estate assets	747
Net Sales Proceeds	11,198
Other income/(expense)
Gain/(loss) on sale of real estate assets	$ 747