v2.4.0.6
Segment Reporting (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting        
Gross real estate assets held for sale $ 0 $ 269,542 $ 0 $ 269,542
Segment net operating income
       
Segment Reporting        
Total revenue 258,805 235,581 509,371 462,304
NOI 175,668 158,759 346,182 307,127
% NOI change from prior year 10.70% 15.40% 12.70% 13.40%
Gross real estate 9,553,603 8,686,705 9,553,603 8,686,705
Established
       
Segment Reporting        
Total revenue 190,279 167,549 377,648 331,660
NOI 132,531 114,605 262,913 224,059
% NOI change from prior year 7.10% 8.10% 8.70% 6.80%
Gross real estate 6,269,438 5,353,408 6,269,438 5,353,408
Established | New England
       
Segment Reporting        
Total revenue 41,736 42,083 82,812 83,110
NOI 27,263 27,006 53,894 52,488
% NOI change from prior year 5.70% 10.50% 7.20% 8.60%
Gross real estate 1,285,318 1,297,280 1,285,318 1,297,280
Established | Metro NY/NJ
       
Segment Reporting        
Total revenue 58,169 48,501 115,388 96,191
NOI 40,637 33,153 80,228 64,712
% NOI change from prior year 6.30% 6.40% 8.00% 5.90%
Gross real estate 1,962,950 1,530,426 1,962,950 1,530,426
Established | Mid-Atlantic
       
Segment Reporting        
Total revenue 25,829 25,600 51,525 50,645
NOI 18,722 18,711 37,538 36,821
% NOI change from prior year 2.40% 6.30% 4.40% 7.30%
Gross real estate 591,284 601,967 591,284 601,967
Established | Pacific Northwest
       
Segment Reporting        
Total revenue 8,119 9,346 16,024 18,475
NOI 5,651 6,349 11,223 12,489
% NOI change from prior year 9.50% 6.40% 10.70% 3.60%
Gross real estate 303,343 360,995 303,343 360,995
Established | Northern California
       
Segment Reporting        
Total revenue 31,918 23,451 63,030 46,277
NOI 23,235 16,993 46,028 33,201
% NOI change from prior year 12.80% 10.00% 14.10% 7.70%
Gross real estate 1,180,167 867,520 1,180,167 867,520
Established | Southern California
       
Segment Reporting        
Total revenue 24,508 18,568 48,869 36,962
NOI 17,023 12,393 34,002 24,348
% NOI change from prior year 8.50% 8.70% 10.20% 5.20%
Gross real estate 946,376 695,220 946,376 695,220
Other Stabilized
       
Segment Reporting        
Total revenue 36,194 34,461 70,979 66,032
NOI 23,244 22,272 45,949 42,296
Gross real estate 1,274,461 1,578,605 1,274,461 1,578,605
Development / Redevelopment
       
Segment Reporting        
Total revenue 29,562 31,239 55,425 59,960
NOI 19,893 21,882 37,320 40,772
Gross real estate 1,656,545 1,459,969 1,656,545 1,459,969
Land Held for Future Development
       
Segment Reporting        
Gross real estate 294,116 225,896 294,116 225,896
Non-allocated
       
Segment Reporting        
Total revenue 2,770 2,332 5,319 4,652
Gross real estate $ 59,043 $ 68,827 $ 59,043 $ 68,827