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Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares | 3 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Common stock dividends and distributions declared | $ 0.13 | $ 0.13 | $ 0.125 | $ 0.125 | $ 0.12 | $ 0.115
Series B Preferred Stock [Member] |  |  |  |  |  |
Preferred stock dividends declared | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50
Series C Preferred Stock [Member] |  |  |  |  |  |
Preferred stock dividends declared | 0.492188 | 0.492188 | $ 0.492188 | $ 0.492188 | $ 0.492188 | $ 0.492188
Series D Preferred Stock [Member] |  |  |  |  |  |
Preferred stock dividends declared | $ 0.515625 | $ 0.41823 |  |  |  |

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