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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
8.25% Series A preferred stock |  |  |
Preferred stock, dividend rate (as a percent) | 8.25% | 8.25% | 8.25%
7.75% Series B preferred stock |  |  |
Preferred stock, dividend rate (as a percent) | 7.75% | 7.75% | 7.75%
8.50% Series C preferred stock |  |  |
Preferred stock, dividend rate (as a percent) | 8.50% | 8.50% | 8.50%

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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Details
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