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Real Estate Investments (Dispositions) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  |  |  |
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Mar. 31, 2011 | Dec. 31, 2011 A | Nov. 22, 2011 Four Four Two Creamery Way [Member] sqft | Oct. 28, 2011 Five Greentree Center and Lake Center II [Member] Properties sqft | Oct. 28, 2011 Five Greentree Centre [Member] | Oct. 28, 2011 Lake Center II [Member] | Jun. 27, 2011 Three Greentree Center [Member] sqft | Dec. 23, 2010 One and Two Greentree Centre, 8000 Lincoln Drive, and Lake Center IV [Member] Properties sqft | Nov. 22, 2010 Spyglass Point [Member] sqft | Sep. 20, 2010 630 Clark Avenue [Member] sqft | Aug. 18, 2010 479 Thomas Jones Way [Member] sqft | Jan. 14, 2010 Westmoreland Plaza [Member] sqft | Oct. 14, 2011 Dallas, Texas [Member] A
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of office properties sold (in properties) |  |  |  | 2 |  |  |  | 4 |  |  |  |  |
Net rentable square feet of properties sold |  |  | 104,500 | 206,243 |  |  | 69,300 | 243,195 | 58,576 | 50,000 | 49,264 | 121,815 |
Sales price of properties sold |  |  | $ 7.4 | $ 22.8 |  |  | $ 5.9 | $ 20.9 | $ 13.5 | $ 3.6 | $ 3.8 | $ 10.8 | $ 0.6
Lease percentage of sold property |  |  | 100.00% |  | 92.20% | 47.80% | 13.90% | 76.10% |  |  | 63.00% |  |
Area of undeveloped parcels of land |  | 4 |  |  |  |  |  |  |  |  |  |  | 6
Gain on sale of ownership interest | $ 2.8 |  |  |  |  |  |  |  |  |  |  |  |
Number of properties with ownership interest | 3 |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest in real estate properties | 11.00% |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Lease percentage of sold property. + References No definition available. + Details
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- Definition Net Rentable Space Sold. + References No definition available. + Details
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- Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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