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Segment Information Segment Information (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2013
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | Segment information is as follows (in thousands):
| Pennsylvania Suburbs |  | Philadelphia CBD |  | Metropolitan, D.C. |  | New Jersey/Delaware |  | Richmond, Virginia |  | Austin, Texas |  | California |  | Corporate |  | Total
As of March 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | $ | 1,179,683 |  |  | $ | 994,939 |  |  | $ | 1,197,904 |  |  | $ | 414,485 |  |  | $ | 310,621 |  |  | $ | 285,540 |  |  | $ | 224,718 |  |  | $ | — |  |  | $ | 4,607,890 |
Construction-in-progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,468 |  |  | 53,468 |
Land inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92,776 |  |  | 92,776 |
As of December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | $ | 1,178,730 |  |  | $ | 988,590 |  |  | $ | 1,193,200 |  |  | $ | 546,644 |  |  | $ | 309,923 |  |  | $ | 285,346 |  |  | $ | 223,736 |  |  | $ | — |  |  | $ | 4,726,169 |
Construction-in-progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,950 |  |  | 48,950 |
Land inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102,439 |  |  | 102,439 |
For the three-months ended March 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 38,187 |  |  | $ | 35,925 |  |  | $ | 27,785 |  |  | $ | 15,602 |  |  | $ | 8,765 |  |  | $ | 9,257 |  |  | $ | 5,389 |  |  | $ | (302 | ) |  | $ | 140,608 |
Property operating expenses, real estate taxes and third party management expenses | 13,977 |  |  | 13,534 |  |  | 10,763 |  |  | 7,408 |  |  | 3,683 |  |  | 3,958 |  |  | 2,395 |  |  | (222 | ) |  | 55,496 |
Net operating income | $ | 24,210 |  |  | $ | 22,391 |  |  | $ | 17,022 |  |  | $ | 8,194 |  |  | $ | 5,082 |  |  | $ | 5,299 |  |  | $ | 2,994 |  |  | $ | (80 | ) |  | $ | 85,112 |
For the three-months ended March 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 38,105 |  |  | $ | 33,149 |  |  | $ | 26,437 |  |  | $ | 15,730 |  |  | $ | 9,034 |  |  | $ | 7,495 |  |  | $ | 4,971 |  |  | $ | (382 | ) |  | $ | 134,539 |
Property operating expenses, real estate taxes and third party management expenses | 13,348 |  |  | 12,686 |  |  | 10,065 |  |  | 7,831 |  |  | 3,643 |  |  | 3,397 |  |  | 2,368 |  |  | (444 | ) |  | 52,894 |
Net operating income | $ | 24,757 |  |  | $ | 20,463 |  |  | $ | 16,372 |  |  | $ | 7,899 |  |  | $ | 5,391 |  |  | $ | 4,098 |  |  | $ | 2,603 |  |  | $ | 62 |  |  | $ | 81,645 |
Reconciliation Of Consolidated Net Operating Income [Table Text Block] |
| Three-month periods ended March 31,
| 2013 |  | 2012
| (amounts in thousands)
Consolidated net operating income | $ | 85,112 |  |  | $ | 81,645 |
Less: |  |  |
Interest expense | (30,914 | ) |  | (34,144 | )
Deferred financing costs | (1,161 | ) |  | (1,311 | )
Depreciation and amortization | (49,861 | ) |  | (48,096 | )
Administrative expenses | (6,551 | ) |  | (6,050 | )
Plus: |  |  |
Interest income | 58 |  |  | 483 |
Interest expense - financing obligation | (218 | ) |  | (182 | )
Equity in income of real estate ventures | 1,535 |  |  | 44 |
Loss on early extinguishment of debt | (3 | ) |  | (248 | )
Loss from continuing operations | (2,003 | ) |  | (7,859 | )
Income from discontinued operations | 5,922 |  |  | 17,195 |
Net income | $ | 3,919 |  |  | $ | 9,336 |

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