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Commitments and Contingencies (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2011 sqft Years | Dec. 31, 2010 | Aug. 05, 2010
Commitments and Contingencies (Textuals) [Abstract] |  |  |
Mortgage lenders with letters-of-credit | $ 1,900,000 | $ 13,200,000 |
Minimum remaining lease period | 18 |  |
Maximum remaining lease period | 92 |  |
Annual rental payment under ground lease | The annual rental payment under this ground lease is ten dollars through August 2022 which is when the initial term of the ground lease will end. After the initial term, the Company has the option to renew the lease until 2091. |  |
Minimum amount of annual rental payment | 3,000,000 |  |
Minimum amount of annual rental payments | 4,000,000 |  |
Aggregate fair market rent future payment as of the date of acquisition |  |  | 27,400,000
Area of Two Logan Square in Philadelphia | 708,844 |  |
Amount to be paid if the Company takes fee title to Two Logan Square upon foreclosure of related mortgage | 2,900,000 |  |
Liability related to acquisition of TRC | 700,000 |  |
Accretion Of Liability Related To Acquisition | 2,900,000 |  |
Balance portion of acquisition related liability | 1,300,000 |  |
Agreed holding period (not to sell) for properties acquired as part of the TRC acquisition | 15 years |  |
Three Logan Square [Member] |  |  |
Commitments and Contingencies (Textuals) [Abstract] |  |  |
Liability related to acquisition of TRC |  |  | 900,000
Three Logan Square [Member] | Ground Lease [Member] |  |  |
Commitments and Contingencies (Textuals) [Abstract] |  |  |
Annual rental payment during initial term of ground lease | $ 10 |  |

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- Definition If the Company takes fee title to Two Logan Square upon a foreclosure of its mortgage, the Company has agreed to pay an unaffiliated third party that holds a residual interest in the fee owner of this property. + References No definition available. + Details
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- Definition Letters-of-credit, funded required leasing and capital reserve accounts for benefit of mortgage lenders + References No definition available. + Details
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- Definition Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer measures those liabilities at their carrying amounts immediately before the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 39, 40, 41 -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 Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(3) -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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