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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.