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Reportable Segments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Reportable Segments |  |  |  |  |
Assets | $ 23,081,830 |  | $ 23,081,830 |  | $ 22,950,614
Payments to Acquire Other Property, Plant, and Equipment |  |  | 81,962 |  |
Rental income: |  |  |  |  |
Total Rental Income | 676,508 | $ 649,766 | 1,341,114 | $ 1,280,491 |
Operating expenses: |  |  |  |  |
Total Operating Expenses | 221,642 | 218,992 | 454,078 | 448,770 |
NOI: |  |  |  |  |
Total NOI | $ 454,866 | 430,774 | $ 887,036 | 831,721 |
Reportable Segments (Textuals) [Abstract] |  |  |  |  |
Units in same store properties | 97,580 |  | 96,761 |  |
Rental income | $ 676,508 | 649,766 | $ 1,341,114 | 1,280,491 |
Property and maintenance expense | (118,005) | (115,382) | (242,565) | (240,948) |
Real estate taxes and insurance expense | (83,119) | (83,055) | (169,551) | (165,149) |
Property management expense | (20,518) | (20,555) | (41,962) | (42,673) |
Total Operating Expenses | (221,642) | (218,992) | (454,078) | (448,770) |
Non-same store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 3,889,003 |  | 3,889,003 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 2,649 |  |
Same Store [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Same store - Rental Income | 645,198 | 614,933 | 1,267,098 | 1,207,334 |
Operating expenses: |  |  |  |  |
Same store - Operating Expenses | 211,126 | 203,515 | 423,791 | 413,053 |
NOI: |  |  |  |  |
Same store - NOI | 434,072 | 411,418 | 843,307 | 794,281 |
Same Store [Domain] | Boston [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 1,868,144 |  | 1,868,144 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 6,525 |  |
Rental income: |  |  |  |  |
Same store - Rental Income | 62,556 | 60,779 | 124,419 | 120,678 |
Operating expenses: |  |  |  |  |
Same store - Operating Expenses | 20,061 | 18,442 | 41,741 | 39,725 |
NOI: |  |  |  |  |
Same store - NOI | 42,495 | 42,337 | 82,678 | 80,953 |
Same Store [Domain] | Denver [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 510,123 |  | 510,123 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 2,958 |  |
Rental income: |  |  |  |  |
Same store - Rental Income | 29,829 | 27,511 | 58,826 | 54,123 |
Operating expenses: |  |  |  |  |
Same store - Operating Expenses | 8,168 | 7,635 | 15,627 | 15,097 |
NOI: |  |  |  |  |
Same store - NOI | 21,661 | 19,876 | 43,199 | 39,026 |
Same Store [Domain] | New York [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 4,602,213 |  | 4,602,213 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 8,365 |  |
Rental income: |  |  |  |  |
Same store - Rental Income | 118,485 | 114,221 | 234,555 | 225,407 |
Operating expenses: |  |  |  |  |
Same store - Operating Expenses | 44,091 | 41,410 | 89,855 | 87,045 |
NOI: |  |  |  |  |
Same store - NOI | 74,394 | 72,811 | 144,700 | 138,362 |
Same Store [Domain] | San Francisco [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 2,683,829 |  | 2,683,829 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 12,676 |  |
Rental income: |  |  |  |  |
Same store - Rental Income | 92,549 | 84,082 | 182,399 | 165,343 |
Operating expenses: |  |  |  |  |
Same store - Operating Expenses | 26,854 | 26,354 | 53,957 | 52,964 |
NOI: |  |  |  |  |
Same store - NOI | 65,695 | 57,728 | 128,442 | 112,379 |
Same Store [Domain] | Seattle [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 1,080,755 |  | 1,080,755 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 6,505 |  |
Rental income: |  |  |  |  |
Same store - Rental Income | 41,515 | 38,890 | 81,906 | 76,511 |
Operating expenses: |  |  |  |  |
Same store - Operating Expenses | 13,030 | 13,036 | 25,697 | 25,770 |
NOI: |  |  |  |  |
Same store - NOI | 28,485 | 25,854 | 56,209 | 50,741 |
Same Store [Domain] | South Florida [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 1,118,604 |  | 1,118,604 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 7,453 |  |
Rental income: |  |  |  |  |
Same store - Rental Income | 50,527 | 47,860 | 99,828 | 94,755 |
Operating expenses: |  |  |  |  |
Same store - Operating Expenses | 18,256 | 17,634 | 36,224 | 35,159 |
NOI: |  |  |  |  |
Same store - NOI | 32,271 | 30,226 | 63,604 | 59,596 |
Same Store [Domain] | Southern California [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 2,768,169 |  | 2,768,169 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 14,390 |  |
Rental income: |  |  |  |  |
Same store - Rental Income | 110,357 | 104,319 | 212,517 | 201,450 |
Operating expenses: |  |  |  |  |
Same store - Operating Expenses | 34,984 | 34,697 | 68,164 | 67,298 |
NOI: |  |  |  |  |
Same store - NOI | 75,373 | 69,622 | 144,353 | 134,152 |
Same Store [Domain] | Washington DC [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 4,222,865 |  | 4,222,865 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 17,340 |  |
Rental income: |  |  |  |  |
Same store - Rental Income | 116,168 | 115,081 | 226,819 | 224,975 |
Operating expenses: |  |  |  |  |
Same store - Operating Expenses | 37,585 | 36,372 | 75,620 | 73,399 |
NOI: |  |  |  |  |
Same store - NOI | 78,583 | 78,709 | 151,199 | 151,576 |
Same Store [Domain] | Non-Core [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 338,125 |  | 338,125 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 3,101 |  |
Rental income: |  |  |  |  |
Same store - Rental Income | 23,212 | 22,190 | 45,829 | 44,092 |
Operating expenses: |  |  |  |  |
Same store - Operating Expenses | 8,097 | 7,935 | 16,906 | 16,596 |
NOI: |  |  |  |  |
Same store - NOI | 15,115 | 14,255 | 28,923 | 27,496 |
Same Store [Domain] | Same Store [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 19,192,827 |  | 19,192,827 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 79,313 |  |
Non-same store [Domain] | Boston [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 176,247 |  | 176,247 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 83 |  |
Rental income: |  |  |  |  |
Non-same store - Rental Income | 2,411 | 791 | 3,336 | 1,819 |
Operating expenses: |  |  |  |  |
Non-same store - Operating Expenses | 652 | 202 | 882 | 412 |
NOI: |  |  |  |  |
Non-same store - NOI | 1,759 | 589 | 2,454 | 1,407 |
Non-same store [Domain] | New York [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 118,166 |  | 118,166 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 0 |  |
Rental income: |  |  |  |  |
Non-same store - Rental Income | 112 | 0 | 115 | 0 |
Operating expenses: |  |  |  |  |
Non-same store - Operating Expenses | 613 | 0 | 609 | 0 |
NOI: |  |  |  |  |
Non-same store - NOI | (501) | 0 | (494) | 0 |
Non-same store [Domain] | Seattle [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 227,930 |  | 227,930 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 21 |  |
Rental income: |  |  |  |  |
Non-same store - Rental Income | 4,816 | 1,129 | 9,396 | 1,240 |
Operating expenses: |  |  |  |  |
Non-same store - Operating Expenses | 1,297 | 511 | 2,596 | 657 |
NOI: |  |  |  |  |
Non-same store - NOI | 3,519 | 618 | 6,800 | 583 |
Non-same store [Domain] | South Florida [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 66,082 |  | 66,082 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 22 |  |
Rental income: |  |  |  |  |
Non-same store - Rental Income | 1,981 | 1,246 | 3,913 | 2,047 |
Operating expenses: |  |  |  |  |
Non-same store - Operating Expenses | 672 | 797 | 1,346 | 1,251 |
NOI: |  |  |  |  |
Non-same store - NOI | 1,309 | 449 | 2,567 | 796 |
Non-same store [Domain] | Southern California [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 842,096 |  | 842,096 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 1,691 |  |
Rental income: |  |  |  |  |
Non-same store - Rental Income | 14,193 | 7,836 | 35,005 | 19,392 |
Operating expenses: |  |  |  |  |
Non-same store - Operating Expenses | 5,375 | 4,019 | 12,864 | 8,642 |
NOI: |  |  |  |  |
Non-same store - NOI | 8,818 | 3,817 | 22,141 | 10,750 |
Non-same store [Domain] | Washington DC [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 239,843 |  | 239,843 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 509 |  |
Rental income: |  |  |  |  |
Non-same store - Rental Income | 3,492 | 2,287 | 10,877 | 7,707 |
Operating expenses: |  |  |  |  |
Non-same store - Operating Expenses | 910 | 854 | 3,024 | 2,989 |
NOI: |  |  |  |  |
Non-same store - NOI | 2,582 | 1,433 | 7,853 | 4,718 |
Non-same store [Domain] | Other (3) [Domain] |  |  |  |  |
Reportable Segments |  |  |  |  |
Assets | 2,218,639 |  | 2,218,639 |  |
Payments to Acquire Other Property, Plant, and Equipment |  |  | 323 |  |
Rental income: |  |  |  |  |
Non-same store - Rental Income | 4,305 | 21,544 | 11,374 | 40,952 |
Operating expenses: |  |  |  |  |
Non-same store - Operating Expenses | 997 | 9,094 | 8,966 | 21,766 |
NOI: |  |  |  |  |
Non-same store - NOI | 3,308 | 12,450 | 2,408 | 19,186 |
Non-same store [Domain] | Non-same store [Domain] |  |  |  |  |
Rental income: |  |  |  |  |
Non-same store - Rental Income | 31,310 | 34,833 | 74,016 | 73,157 |
Operating expenses: |  |  |  |  |
Non-same store - Operating Expenses | 10,516 | 15,477 | 30,287 | 35,717 |
NOI: |  |  |  |  |
Non-same store - NOI | $ 20,794 | $ 19,356 | $ 43,729 | $ 37,440 |

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