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Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) (USD $) | 6 Months Ended
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Jun. 30, 2012
Common distributions declared per share | $ 0.440
Preferred Stock [Member] |
Redemption of 3,264,362 shares of 6.75% Series G Cumulative Redeemable Shares, Shares | 3,264,362
6.75% Series G Cumulative Redeemable Preferred Stock |
Preferred stock distributions declared | $ 0.567188
Series E Preferred Stock [Member] |
Preferred stock distributions declared | $ 0.6644

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