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Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Common distributions declared per share | $ 1.11 | $ 1.0400 | $ 0.9400
Series E Preferred Stock [Member] |  |  |
Preferred stock distributions declared | $ 1.3288 | $ 1.3288 | $ 1.3288

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