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Quarterly Financial Information (Unaudited) (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, previously reported in Form 10-Q |  |  | $ 641,950 |  | $ 616,448 |  | $ 573,694 |  | $ 571,401 |  | $ 562,528 |  | $ 362,630 |  | $ 268,432 |  |  |  |
Revenues, previously reported, subsequently reclassified to discontinued operations in Form 10-Q |  |  | 430 |  | 1,946 |  | 5,128 |  | 8,256 |  | 7,837 |  | 3,209 |  | 2,036 |  |  |  |
Total revenues disclosed in Form 10-K | 660,711 | [1] | 641,520 | [1] | 614,502 | [1] | 568,566 | [1] | 563,145 | [2] | 554,691 | [2] | 359,421 | [2] | 266,396 | [2] | 2,485,299 | 1,743,653 | 1,000,634
Income from continuing operations attributable to common stockholders, previously reported in Form 10-Q |  |  | 115,329 |  | 42,543 |  | 48,297 |  | 193,216 |  | 102,470 |  | 18,906 |  | 48,218 |  |  |  |
Income from continuing operations attributable to common stockholders, previously reported in Form 10-Q subsequently reclassified to discontinued operations |  |  | (646) |  | (953) |  | 187 |  | (337) |  | (721) |  | 456 |  | 279 |  |  |  |
Income from continuing operations attributable to common stockholders | 97,992 | [1] | 115,975 | [1] | 43,496 | [1] | 48,110 | [1] | 193,553 | [2] | 103,191 | [2] | 18,450 | [2] | 47,939 | [2] | 305,573 | 363,133 | 213,444
Discontinued operations, previously reported in Form 10-Q |  |  | (3,447) |  | 31,482 |  | 42,329 |  | (268) |  | 415 |  | 770 |  | 766 |  |  |  |
Discontinued operations from properties sold or held for sale subsequent to the respective reporting period |  |  | (646) |  | (953) |  | 187 |  | (337) |  | (721) |  | 456 |  | 279 |  |  |  |
Discontinued operations disclosed in Form 10-K | $ (11,725) | [1] | $ (4,093) | [1] | $ 30,529 | [1] | $ 42,516 | [1] | $ (605) | [2] | $ (306) | [2] | $ 1,226 | [2] | $ 1,045 | [2] | $ 57,227 | $ 1,360 | $ 32,723
[1] | The amounts presented for the three months ended March 31, 2012, June 30, 2012 and September 30, 2012 differ from the amounts previously reported in our Quarterly Reports on Form 10-Q as a result of discontinued operations consisting of properties sold in 2012 or classified as held for sale as of December 31, 2012.
[2] | The amounts presented for the three months ended March 31, 2011, June 30, 2011, September 30, 2011 and December 31, 2011 differ from the amounts previously reported in our Annual Report on Form 10-K for the year ended December 31, 2011 as a result of discontinued operations consisting of properties sold in 2012 or classified as held for sale as of December 31, 2012.

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