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Subsequent Events (Details) (USD $) | 3 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Apr. 04, 2012 ATM Equity Offering Sales [Member] | Apr. 25, 2012 Tampa, FL Office Property Disposition [Member] | Apr. 27, 2012 Cary, NC Office Property Acquisition [Member] sqft
Subsequent Event [Line Items] |  |  |  |  |
Number of Common Stock sold at the market during period (in shares) | 785,500 |  | 307,900 |  |
Average price of Common Stock sold at the market during period (in dollars per share) | $ 32.82 |  | $ 32.93 |  |
Net proceeds of Common Stock sold at the market during period | $ 25,400,000 |  | $ 10,000,000 |  |
Gross proceeds from the sale of real estate |  |  |  | 9,500,000 |
Gains on disposition of discontinued operations | 5,134,000 | 0 |  | 1,400,000 |
Rentable square feet of acquisition (in sq ft) |  |  |  |  | 178,300
Acquisition purchase price |  |  |  |  | 26,000,000
Joint venture's net proceeds received from disposition of property |  |  |  |  | $ 25,300,000

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- Definition Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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