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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) (Parenthetical) - $ / shares | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Series A Preferred Stock |  |
Preferred stock dividend rate (in dollars per share) | $ 0.87 | $ 0.87
Series B Preferred Stock |  |
Preferred stock dividend rate (in dollars per share) | $ 0.56 | $ 0.49

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- Details
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