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Segment Information Segment Information (Tables) | 6 Months Ended
--- | ---
Jun. 30, 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 June 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | $ | 1,198,731 |  |  | $ | 1,023,619 |  |  | $ | 1,199,885 |  |  | $ | 408,940 |  |  | $ | 310,229 |  |  | $ | 286,808 |  |  | $ | 192,248 |  |  | $ | — |  |  | $ | 4,620,460 |
Construction-in-progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,260 |  |  | 51,260 |
Land inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,444 |  |  | 94,444 |
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 June 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 37,276 |  |  | $ | 36,142 |  |  | $ | 28,783 |  |  | $ | 15,676 |  |  | $ | 8,954 |  |  | $ | 9,871 |  |  | $ | 4,536 |  |  | $ | (319 | ) |  | $ | 140,919 |
Property operating expenses, real estate taxes and third party management expenses | 13,151 |  |  | 13,587 |  |  | 10,774 |  |  | 7,245 |  |  | 3,599 |  |  | 4,208 |  |  | 2,339 |  |  | 165 |  |  | 55,068 |
Net operating income | $ | 24,125 |  |  | $ | 22,555 |  |  | $ | 18,009 |  |  | $ | 8,431 |  |  | $ | 5,355 |  |  | $ | 5,663 |  |  | $ | 2,197 |  |  | $ | (484 | ) |  | $ | 85,851 |
For the three-months ended June 30, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 36,784 |  |  | $ | 31,911 |  |  | $ | 26,967 |  |  | $ | 15,284 |  |  | $ | 8,903 |  |  | $ | 8,188 |  |  | $ | 4,210 |  |  | $ | (444 | ) |  | $ | 131,803 |
Property operating expenses, real estate taxes and third party management expenses | 12,640 |  |  | 11,962 |  |  | 10,451 |  |  | 7,083 |  |  | 3,470 |  |  | 3,611 |  |  | 2,249 |  |  | (331 | ) |  | 51,135 |
Net operating income | $ | 24,144 |  |  | $ | 19,949 |  |  | $ | 16,516 |  |  | $ | 8,201 |  |  | $ | 5,433 |  |  | $ | 4,577 |  |  | $ | 1,961 |  |  | $ | (113 | ) |  | $ | 80,668 |
For the six-months ended June 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 75,461 |  |  | $ | 72,067 |  |  | $ | 56,567 |  |  | $ | 31,278 |  |  | $ | 17,719 |  |  | $ | 19,129 |  |  | $ | 9,142 |  |  | $ | (621 | ) |  | $ | 280,742 |
Property operating expenses, real estate taxes and third party management expenses | 27,050 |  |  | 27,121 |  |  | 21,536 |  |  | 14,653 |  |  | 7,282 |  |  | 8,165 |  |  | 4,498 |  |  | (57 | ) |  | 110,248 |
Net operating income | $ | 48,411 |  |  | $ | 44,946 |  |  | $ | 35,031 |  |  | $ | 16,625 |  |  | $ | 10,437 |  |  | $ | 10,964 |  |  | $ | 4,644 |  |  | $ | (564 | ) |  | $ | 170,494 |
For the six-months ended June 30, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 74,736 |  |  | $ | 65,062 |  |  | $ | 53,403 |  |  | $ | 31,013 |  |  | $ | 17,937 |  |  | $ | 15,682 |  |  | $ | 8,586 |  |  | $ | (826 | ) |  | $ | 265,593 |
Property operating expenses, real estate taxes and third party management expenses | 25,902 |  |  | 24,648 |  |  | 20,518 |  |  | 14,912 |  |  | 7,112 |  |  | 7,009 |  |  | 4,384 |  |  | (771 | ) |  | 103,714 |
Net operating income | $ | 48,834 |  |  | $ | 40,414 |  |  | $ | 32,885 |  |  | $ | 16,101 |  |  | $ | 10,825 |  |  | $ | 8,673 |  |  | $ | 4,202 |  |  | $ | (55 | ) |  | $ | 161,879 |
Reconciliation Of Consolidated Net Operating Income [Table Text Block] |
| Three-month periods ended June 30, |  | Six-month periods ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (amounts in thousands) |  | (amounts in thousands)
Consolidated net operating income | $ | 85,851 |  |  | $ | 80,668 |  |  | $ | 170,494 |  |  | $ | 161,879 |
Less: |  |  |  |  |  |  |
Interest expense | (30,437 | ) |  | (32,981 | ) |  | (61,351 | ) |  | (67,125 | )
Deferred financing costs | (1,183 | ) |  | (1,261 | ) |  | (2,344 | ) |  | (2,572 | )
Depreciation and amortization | (49,300 | ) |  | (47,476 | ) |  | (98,846 | ) |  | (95,350 | )
General and administrative expenses | (7,335 | ) |  | (6,079 | ) |  | (13,886 | ) |  | (12,129 | )
Plus: |  |  |  |  |  |  |
Interest income | 122 |  |  | 1,838 |  |  | 180 |  |  | 2,320 |
Interest expense - financing obligation | (211 | ) |  | (196 | ) |  | (429 | ) |  | (378 | )
Equity in income of real estate ventures | 1,508 |  |  | 838 |  |  | 3,043 |  |  | 882 |
Gain from remeasurement of investment in a real estate venture | 7,847 |  |  | — |  |  | 7,847 |  |  | — |
Net gain (loss) on real estate venture transactions | 3,683 |  |  | (11 | ) |  | 3,683 |  |  | (11 | )
Loss on early extinguishment of debt | (1,113 | ) |  | (1,250 | ) |  | (1,116 | ) |  | (1,498 | )
Income (loss) from continuing operations | 9,432 |  |  | (5,910 | ) |  | 7,275 |  |  | (13,982 | )
Income from discontinued operations | (2,252 | ) |  | 12,712 |  |  | 3,824 |  |  | 30,120 |
Net income | $ | 7,180 |  |  | $ | 6,802 |  |  | $ | 11,099 |  |  | $ | 16,138 |

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