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Real Estate Investments (Tables) | 12 Months Ended
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Dec. 31, 2011
Real Estate [Abstract] |
Gross carrying value of rental properties |
| December 31,
| 2011 |  | 2010
Land | $ | 677,891 |  |  | $ | 697,724 |
Building and improvements | 3,631,388 |  |  | 3,693,579 |
Tenant improvements | 483,801 |  |  | 442,808 |
| $ | 4,793,080 |  |  | $ | 4,834,111 |
Business acquisition, purchase price allocation |
| August 5,
| 2010
Building and tenant improvements | $ | 98,188 |
Intangible assets acquired | 28,856 |
Below market lease liabilities assumed | (683 | )
Total | $ | 126,361 |
Schedule of Intangibles assets and liabilities acquired |
| August 5, 2010 |  | Weighted Average Amortization Period (in years)
Intangible assets: |  |  |
In-place lease value | $ | 13,584 |  |  | 3 |
Tenant relationship value | 8,870 |  |  | 5 |
Above market tenant leases acquired | 895 |  |  | 1 |
Below market ground lease acquired | 5,507 |  |  | 82 |
Total | $ | 28,856 |  |  | 23 |
Intangible liabilities: |  |  |
Below market leases acquired | $ | 683 |  |  | 1 |
Operating results of acquired property included in parent company results of operations |
| For the period from August 5 to December 31, 2010
Revenue: |
Rents | $ | 6,347 |
Tenant Reimbursements | 933 |
Other | 45 |
Total revenue | $ | 7,325 |
Loss from operations (includes depreciation and intangible asset amortization) | $ | (3,602 | )
Supplemental pro forma operating data |
| December 31,
| 2010 |  | 2009
| (unaudited)
Pro forma revenues | $ | 582,642 |  |  | $ | 604,440 |
Pro forma income (loss) from continuing operations | (29,000 | ) |  | 7,890 |
Pro forma net income (loss) available to common shareholders | (24,940 | ) |  | 2,306 |
Earnings per common share from continuing operations: |  |  |
Basic — as reported | $ | (0.29 | ) |  | $ | (0.04 | )
Basic — as pro forma | $ | (0.28 | ) |  | $ | — |
Diluted — as reported | $ | (0.29 | ) |  | $ | (0.04 | )
Diluted — as pro forma | $ | (0.28 | ) |  | $ | — |
Earnings per common share: |  |  |
Basic — as reported | $ | (0.19 | ) |  | $ | — |
Basic — as pro forma | $ | (0.19 | ) |  | $ | 0.02 |
Diluted — as reported | $ | (0.19 | ) |  | $ | — |
Diluted — as pro forma | $ | (0.19 | ) |  | $ | 0.02 |

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