Discontinued Operations (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rental revenues, tenant reimbursements and other income	$ 3,260,000		$ 1,474,000	$ 5,201,000	$ 2,875,000
Operating expenses and real estate taxes				(3,700,000)
Depreciation and amortization	(873,000)		(622,000)	(2,111,000)	(1,082,000)
Impairment of real estate		0		0	(3,368,000)
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rental revenues, tenant reimbursements and other income	599,000		1,297,000	1,153,000	2,640,000
Operating expenses and real estate taxes	(670,000)		(1,155,000)	(1,389,000)	(2,238,000)
Depreciation and amortization	0		(149,000)	0	(402,000)
Impairment of real estate	0		(3,368,000)	0	(3,368,000)
Gain on sales of real estate net	0		37,000	0	4,088,000
Income (loss) from discontinued operations	$ (71,000)		$ (3,338,000)	$ (236,000)	$ 720,000