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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) (Parenthetical) - $ / shares | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 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) | $ 0.60 | $ 0.50

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- Details
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