Discontinued Operations Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Waterstone and Meridian [Member] Property sqft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties under agreement to sell			2
Area of real estate property (in square feet)			190,000	[1]
Investment property			$ 9,285
Accumulated depreciation			0
Office property held for sale			9,285
Rents receivable and other assets			546
Total assets held for sale	9,831	0	9,831
Accounts payable and other liabilities			325
Total liabilities related to assets held for sale	$ 325	$ 0	$ 325

[1] Gains and losses on assets held for sale are expected to be finalized upon sale and reflected in the nine months ended September 30, 2013 financial statements.