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Real Estate Assets (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 acre | Dec. 31, 2010 | Dec. 31, 2009
Acquisitions [Abstract] |  |  |
Acquisition of development land (in acres) | 586 |  |
Business Acquisition, Purchase Price Allocation [Abstract] |  |  |
Amount of real estate assets acquired | $ 241,602,000 |  |
Amount of acquisition-related intangible assets (in deferred leasing and financing costs) acquired | 39,721,000 |  |
Amount of furniture, fixtures and equipment (in prepaid and other assets) acquired | 1,101,000 |  |
Amount of acquisition-related intangible liabilities (in accounts payable, accrued liabilities and other expenses assumed) | (15,627,000) |  |
Total consideration from the acquisition | 266,797,000 |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |
Proforma rental and other revenues | 524,480,000 | 511,861,000 | 505,840,000
Proforma net income | 45,674,000 | 65,409,000 | 57,471,000
Proforma earnings per share - basic | $ 0.50 | $ 0.77 | $ 0.70
Proforma earnings per share - diluted | $ 0.50 | $ 0.77 | $ 0.70
Dispositions [Abstract] |  |  |
Number of industrial properties sold | 6 |  |
Gain on disposition of discontinued operations | 2,573,000 | (86,000) | 21,466,000
Gains on disposition of property | 764,000 | 74,000 | 266,000
Amount of impairment recorded on disposition | 2,429,000 | 0 | 2,554,000
Pittsburgh PA Office Property Acquisition [Member] |  |  |
Acquisitions [Abstract] |  |  |
Net rentable square feet of acquisition (in sqft) | 1,540,000 |  |
Acquisition purchase price | 188,500,000 |  |
Fair value of assumed debt from the acquisition | 124,500,000 |  |
Effective interest rate of assumed secured debt from the acquisition | 4.27% |  |
Maturity of assumed debt from the acquisition | Nov. 01, 2017 |  |
Acquisition-related costs | 4,000,000 |  |
Atlanta GA Office Property Acquisition [Member] |  |  |
Acquisitions [Abstract] |  |  |
Net rentable square feet of acquisition (in sqft) | 503,000 |  |
Acquisition purchase price | 78,300,000 |  |
Fair value of assumed debt from the acquisition | 67,900,000 |  |
Effective interest rate of assumed secured debt from the acquisition | 5.45% |  |
Maturity of assumed debt from the acquisition | Jan. 01, 2014 |  |
Acquisition-related costs | 300,000 |  |
Raleigh NC Office Property Acquisition [Member] |  |  |
Acquisitions [Abstract] |  |  |
Net rentable square feet of acquisition (in sqft) | 48,000 |  |
Acquisition purchase price | 8,900,000 |  |
Acquisition-related costs | 100,000 |  |
Memphis TN Office Property Acquisition [Member] |  |  |
Acquisitions [Abstract] |  |  |
Net rentable square feet of acquisition (in sqft) |  | 336,000 |
Acquisition purchase price |  | 52,600,000 |
Fair value of assumed debt from the acquisition |  | 40,300,000 |
Effective interest rate of assumed secured debt from the acquisition |  | 6.43% |
Maturity of assumed debt from the acquisition |  | Nov. 01, 2015 |
Acquisition-related costs |  | 400,000 |
Tampa FL Office Property and Land Acquisition [Member] |  |  |
Acquisitions [Abstract] |  |  |
Net rentable square feet of acquisition (in sqft) |  | 117,000 |
Acquisition of development land (in acres) |  | 32.6 |
Acquisition purchase price |  | 12,000,000 |
Acquisition-related costs |  | 200,000 |
For Sale Residential Condominium JV Interest Acquisition [Member] |  |  |
Acquisitions [Abstract] |  |  |
Acquisition purchase price |  | 500,000 |
Tampa FL Office Property Acquisition (2) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Net rentable square feet of acquisition (in sqft) |  |  | 220,000
Acquisition purchase price |  |  | 22,300,000
Acquisition-related costs |  |  | 100,000
Winston-Salem NC Disposition [Member] |  |  |
Dispositions [Abstract] |  |  |
Gross proceeds from the sale of real estate | 15,000,000 |  |
Gain on disposition of discontinued operations | 2,600,000 |  |
Gains on disposition of property | 300,000 |  |
Winston-Salem NC and Greensboro NC Office and Industrial Property Disposition [Member] |  |  |
Dispositions [Abstract] |  |  |
Number of office properties sold |  | 7 |
Number of industrial properties sold |  | 6 |
Gross proceeds from the sale of real estate |  | 24,900,000 |
Cash received from sale of real estate |  | 7,900,000 |
Amount of seller financing provided |  | 17,000,000 |
Additional potential seller financing commitment |  | 1,700,000 |
Amount of commited additional seller financing funded | 200,000 |  |
Amount of impairment recorded on disposition |  | 300,000 |
Deferred gain on sale of property |  | 400,000 |
Impairments [Abstract] |  |  |
Impairment of long lived assets in discontinued operations |  |  | 11,000,000
Raleigh NC Office Property Disposition [Member] |  |  |
Dispositions [Abstract] |  |  |
Gains on disposition of property |  | 200,000 |
Non-Core Retail and Office Property Disposition [Member] |  |  |
Dispositions [Abstract] |  |  |
Net rentable square feet of disposition |  |  | 517,000
Gross proceeds from the sale of real estate |  |  | 78,200,000
Gains on disposition of property |  |  | 21,700,000
Orlando FL Office Property Impairment [Member] |  |  |
Dispositions [Abstract] |  |  |
Amount of impairment recorded on disposition | 2,400,000 |  |
Impairments [Abstract] |  |  |
Number of long lived assets held for use impaired | 2 |  |
Winston-Salem NC Office Property Impairment [Member] |  |  |
Dispositions [Abstract] |  |  |
Amount of impairment recorded on disposition |  |  | $ 2,600,000
Impairments [Abstract] |  |  |
Number of long lived assets held for use impaired |  |  | 4

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 26 -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 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6743430&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 7, 25 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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