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CONSOLIDATED STATEMENTS OF OPERATIONS (Parentheticals) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Preferred dividend rate | 6.50% | 6.50% | 6.50%

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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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