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Segment Information (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2014
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 Washington, D.C. |  | New Jersey/Delaware |  | Richmond, Virginia |  | Austin, Texas |  | California |  | Corporate |  | Total
As of March 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | $ | 1,209,328 |  |  | $ | 1,318,170 |  |  | $ | 1,219,542 |  |  | $ | 414,353 |  |  | $ | 310,465 |  |  | $ | 36,480 |  |  | $ | 192,951 |  |  | $ | — |  |  | $ | 4,701,289 |
Construction-in-progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,140 |  |  | 90,140 |
Land inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,427 |  |  | 96,427 |
Investment in real estate ventures, at equity (a) | $ | 17,379 |  |  | $ | 20,131 |  |  | $ | 59,847 |  |  | $ | — |  |  | $ | 1,355 |  |  | $ | 81,525 |  |  | $ | — |  |  | $ | — |  |  | $ | 180,237 |
As of December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | $ | 1,199,105 |  |  | $ | 1,300,666 |  |  | $ | 1,214,965 |  |  | $ | 414,716 |  |  | $ | 310,397 |  |  | $ | 36,856 |  |  | $ | 192,584 |  |  | $ | — |  |  | $ | 4,669,289 |
Construction-in-progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,174 |  |  | 74,174 |
Land inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93,351 |  |  | 93,351 |
Investment in real estate ventures, at equity | $ | 17,272 |  |  | $ | 19,975 |  |  | $ | 59,905 |  |  | $ | — |  |  | $ | 1,400 |  |  | $ | 81,960 |  |  | $ | — |  |  | $ | — |  |  | $ | 180,512 |
For the three-month period ended March 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 40,574 |  |  | $ | 49,414 |  |  | $ | 30,690 |  |  | $ | 15,625 |  |  | $ | 8,867 |  |  | $ | 2,081 |  |  | $ | 4,602 |  |  | $ | 261 |  |  | $ | 152,114 |
Property operating expenses, real estate taxes and third party management expenses | 14,687 |  |  | 18,443 |  |  | 11,957 |  |  | 8,692 |  |  | 4,340 |  |  | 1,176 |  |  | 2,409 |  |  | 270 |  |  | 61,974 |
Net operating income | $ | 25,887 |  |  | $ | 30,971 |  |  | $ | 18,733 |  |  | $ | 6,933 |  |  | $ | 4,527 |  |  | $ | 905 |  |  | $ | 2,193 |  |  | $ | (9 | ) |  | $ | 90,140 |
Equity in income of real estate ventures | $ | 32 |  |  | $ | (21 | ) |  | $ | 67 |  |  | $ | 18 |  |  | $ | (45 | ) |  | $ | 191 |  |  | $ | — |  |  | $ | — |  |  | $ | 242 |
For the three-month period ended March 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 37,916 |  |  | $ | 35,925 |  |  | $ | 27,785 |  |  | $ | 14,919 |  |  | $ | 8,765 |  |  | $ | 9,257 |  |  | $ | 4,605 |  |  | $ | 382 |  |  | $ | 139,554 |
Property operating expenses, real estate taxes and third party management expenses | 14,436 |  |  | 13,534 |  |  | 10,763 |  |  | 7,031 |  |  | 3,683 |  |  | 3,958 |  |  | 2,160 |  |  | (496 | ) |  | 55,069 |
Net operating income | $ | 23,480 |  |  | $ | 22,391 |  |  | $ | 17,022 |  |  | $ | 7,888 |  |  | $ | 5,082 |  |  | $ | 5,299 |  |  | $ | 2,445 |  |  | $ | 878 |  |  | $ | 84,485 |
Equity in income of real estate ventures | $ | 31 |  |  | $ | 566 |  |  | $ | 16 |  |  | $ | 908 |  |  | $ | (8 | ) |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,535 |
(a) Does not include the negative investment balance of one real estate venture totaling $1.2 million as of March 31, 2014, which was included in other liabilities.
Reconciliation Of Consolidated Net Operating Income [Table Text Block] |
| Three month periods ended March 31,
| 2014 |  | 2013
| (amounts in thousands)
Consolidated net operating income | $ | 90,140 |  |  | $ | 84,485 |
Less: |  |  |
Interest expense | (31,844 | ) |  | (30,914 | )
Interest expense - amortization of deferred financing costs | (1,189 | ) |  | (1,161 | )
Interest expense - financing obligation | (272 | ) |  | (218 | )
Depreciation and amortization | (52,570 | ) |  | (49,476 | )
General and administrative expenses | (8,181 | ) |  | (6,551 | )
Loss on real estate venture transactions | (135 | ) |  | — |
Loss on early extinguishment of debt | — |  |  | (3 | )
Plus: |  |  |
Interest income | 385 |  |  | 58 |
Equity in income of real estate ventures | 242 |  |  | 1,535 |
Gain on sale of undepreciated real estate | 1,187 |  |  | — |
Loss from continuing operations | (2,237 | ) |  | (2,245 | )
Income (loss) from discontinued operations | (8 | ) |  | 6,164 |
Net income (loss) | $ | (2,245 | ) |  | $ | 3,919 |

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