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Real Estate Investments Acquisitions and Dispositions (Details) (USD $) | 6 Months Ended |  |  |  |  |  | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 28, 2013 The Bluffs [Member] sqft | Jun. 19, 2013 100 Applebrook [Member] sqft | Jun. 28, 2013 100 Arrandale Boulevard [Member] sqft | Jun. 14, 2013 Pacific View Plaza [Member] sqft | Feb. 25, 2013 Princeton Pike Corporate Center [Member] Properties sqft | Apr. 25, 2013 Three Logan Square [Member] acre
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |
Area of land acquired |  |  |  |  |  |  |  | 0
Number of real estate properties sold |  |  |  |  |  |  | 8 |
Net Rentable Space Sold |  |  | 67,909 | 28,000 | 34,931 | 51,695 | 800,546 |
Sale Consideration Of Sold Property |  |  | $ 18,000,000 | $ 2,700,000 | $ 3,500,000 | $ 10,300,000 | $ 121,000,000 |
Lease percentage of sold property |  |  | 98.80% |  |  | 90.50% | 86.90% |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  |  |  |  |  |  |  | 20,800,000
Adjustment to Record Land Acquisition to Fair Value | (4,386,000) | 0 |  |  |  |  |  | 4,300,000
Business Acquisition, Cost of Acquired Entity, Transaction Costs |  |  |  |  |  |  |  | $ 100,000

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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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