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Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, 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 | $ 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 | 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 | (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
Net income attributable to common stockholders | $ 86,267 |  | $ 111,882 |  | $ 74,025 |  | $ 90,626 |  | $ 192,948 |  | $ 102,885 |  | $ 19,676 |  | $ 48,984 |  | $ 362,800 | $ 364,493 | $ 246,167
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributable to common stockholders (in dollars per share) | $ 0.33 |  | $ 0.39 |  | $ 0.15 |  | $ 0.16 |  | $ 0.67 |  | $ 0.36 |  | $ 0.10 |  | $ 0.30 |  | $ 1.04 | $ 1.59 | $ 1.36
Discontinued operations (in dollars per share) | $ (0.04) |  | $ (0.01) |  | $ 0.11 |  | $ 0.15 |  | $ 0.00 |  | $ 0.00 |  | $ 0.01 |  | $ 0.01 |  | $ 0.20 | $ 0.01 | $ 0.21
Net income attributable to common stockholders (in dollars per share) | $ 0.29 |  | $ 0.38 |  | $ 0.26 |  | $ 0.31 |  | $ 0.67 |  | $ 0.36 |  | $ 0.11 |  | $ 0.31 |  | $ 1.24 | $ 1.60 | $ 1.57
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributable to common stockholders (in dollars per share) | $ 0.33 |  | $ 0.39 |  | $ 0.15 |  | $ 0.16 |  | $ 0.66 |  | $ 0.35 |  | $ 0.10 |  | $ 0.29 |  | $ 1.04 | $ 1.57 | $ 1.35
Discontinued operations (in dollars per share) | $ (0.04) |  | $ (0.01) |  | $ 0.10 |  | $ 0.15 |  | $ 0.00 |  | $ 0.00 |  | $ 0.01 |  | $ 0.01 |  | $ 0.19 | $ 0.01 | $ 0.21
Net income attributable to common stockholders (in dollars per share) | $ 0.29 |  | $ 0.38 |  | $ 0.25 |  | $ 0.31 |  | $ 0.66 |  | $ 0.35 |  | $ 0.11 |  | $ 0.30 |  | $ 1.23 | $ 1.58 | $ 1.56
Dividends declared per common share (in dollars per share) | $ 0.62 |  | $ 0.62 |  | $ 0.62 |  | $ 0.62 |  | $ 0.575 |  | $ 0.4486 |  | $ 0.7014 |  | $ 0.575 |  |  |  |
[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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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration