Quarterly report pursuant to Section 13 or 15(d)

Nature of Business (Details)

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Nature of Business (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Percentage of distribution of ordinary taxable income 90.00%  
Contract sale price   $ 23,000
Atrium Building [Member]
   
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Contract sale price $ 15,750