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Real Estate Assets Real Estate Assets (Tables) | 12 Months Ended
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Dec. 31, 2011
Real Estate [Abstract] |
Schedule of Purchase Price Allocation [Table Text Block] | The following table sets forth a summary of the acquisition purchase price consideration for each major class of assets acquired and liabilities assumed in the acquisitions discussed above:
| Total Purchase Price Consideration
Real estate assets | $ | 241,602 |
Acquisition-related intangible assets (in deferred financing and leasing costs) | 39,721 |
Furniture, fixtures and equipment (in prepaid expenses and other assets) | 1,101 |
Acquisition-related intangible liabilities (in accounts payable, accrued expenses and other liabilities) | (15,627 | )
Total consideration | $ | 266,797 |
Business Acquisition, Pro Forma Information [Table Text Block] | The following tables set forth our rental and other revenues and net income, adjusted for interest expense and depreciation and amortization related to purchase price allocation, assuming the acquisitions discussed above both occurred as of the beginning of each annual reporting period:
| Year Ended December 31,
| 2011 |  | 2010 |  | 2009
Proforma rental and other revenues | $ | 524,480 |  |  | $ | 511,861 |  |  | $ | 505,840 |
Proforma net income | $ | 45,674 |  |  | $ | 65,409 |  |  | $ | 57,471 |
Proforma earnings per share - basic | $ | 0.50 |  |  | $ | 0.77 |  |  | $ | 0.70 |
Proforma earnings per share - diluted | $ | 0.50 |  |  | $ | 0.77 |  |  | $ | 0.70 |

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 54 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 141 -Paragraph 55 -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 Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(2, 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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- Definition Tabular disclosure of all of the fair values of the purchase price and assets and liabilities acquired in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 805 -SubTopic 30 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6927-128479 + Details
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