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Segment Reporting (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting    
Total revenue $ 400,075 $ 301,357
NOI 268,845 207,683
% NOI change from prior year 29.30% 29.10%
Gross real estate 17,060,533 15,647,138
Gross real estate assets held for sale   510,623
Established
    
Segment Reporting    
Total revenue 235,128 201,979
NOI 162,698 140,261
% NOI change from prior year 2.60% 5.50%
Gross real estate 7,438,720 6,570,621
Established | New England
    
Segment Reporting    
Total revenue 48,630 43,350
NOI 29,904 27,712
% NOI change from prior year (2.00%) 1.70%
Gross real estate 1,489,948 1,360,858
Established | Metro NY/NJ
    
Segment Reporting    
Total revenue 72,354 61,244
NOI 50,019 42,439
% NOI change from prior year 1.30% 5.50%
Gross real estate 2,187,554 1,915,890
Established | Mid-Atlantic
    
Segment Reporting    
Total revenue 24,647 25,035
NOI 17,455 18,188
% NOI change from prior year (3.00%) 1.60%
Gross real estate 644,657 631,207
Established | Pacific Northwest
    
Segment Reporting    
Total revenue 13,129 11,376
NOI 9,134 7,850
% NOI change from prior year 3.20% 10.50%
Gross real estate 498,710 443,564
Established | Northern California
    
Segment Reporting    
Total revenue 42,219 34,064
NOI 32,834 25,609
% NOI change from prior year 11.40% 11.40%
Gross real estate 1,400,087 1,231,893
Established | Southern California
    
Segment Reporting    
Total revenue 34,149 26,910
NOI 23,352 18,463
% NOI change from prior year 4.20% 5.90%
Gross real estate 1,217,764 987,209
Other Stabilized
    
Segment Reporting    
Total revenue 132,320 73,932
NOI 90,071 51,433
Gross real estate 6,543,948 6,733,024
Development / Redevelopment
    
Segment Reporting    
Total revenue 29,550 23,174
NOI 16,076 15,989
Gross real estate 2,786,334 1,915,146
Land Held for Future Development
    
Segment Reporting    
Gross real estate 250,204 359,029
Non-allocated
    
Segment Reporting    
Total revenue 3,077 2,272
Gross real estate $ 41,327 $ 69,318