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Real Estate Investments (Details Textuals) (USD $) | Jun. 30, 2011 | Mar. 28, 2011 Overlook I And II [Member] sqft | Jan. 20, 2011 Parcel of land in PA [Member] | Jan. 20, 2011 Parcel of land in PA [Member] Partnership Interest [Member] | Aug. 05, 2010 Three Logan Square [Member] sqft | Aug. 05, 2010 Three Logan Square [Member] Partnership Interest [Member]
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Real Estate Investments (Textuals) |  |  |  |  |  |
Net rentable space of property acquired |  | 126,496 |  |  | 1,000,000 |
Recognized tenant and other receivables from acquisition |  |  |  |  | $ 1,100,000 |
Prepaid real estate taxes from acquisition |  |  |  |  | 1,500,000 |
Advance under credit facility |  | 600,000,000 |  |  |  |
Acquisition related costs |  |  | 500,000 |  | 400,000 |
Number of storey of office tower acquired |  |  |  |  | 53 |
Business Acquisition, Equity Interest Issued or Issuable, Description |  |  |  | 50% limited interest in the partnership |  |
Business Acquisition, consideration received |  |  | 4,900,000 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Units |  |  |  |  |  | 7,111,112
Lease percentage of acquired property |  | 100.00% |  |  | 67.20% |
Acquisitions through cash |  |  |  |  | 51,200,000 |
Assumed security deposits obligations | 700,000 |  |  |  | 900,000 |
Closing market price of Parent Company's common shares on acquisition date |  |  |  |  | 11.54 |
Annual dividend rate per share |  |  |  |  | $ 0.60 |
Net amount of cash paid after assumed liabilities |  |  |  |  | 50,300,000 |
Acquired real estate, cost of property |  | $ 12,600,000 | $ 9,300,000 |  | $ 129,000,000 |

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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(1) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d + 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 shall measure those liabilities at their carrying amounts immediately before the acquisition date. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 39, 40, 41 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(3) + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 + Details
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