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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
PREFERRED STOCK (Par Value: $0.01): |  |  |
Issuance of preferred stock, shares | 515,000 |  |
COMMON STOCK (Par Value: $0.01): |  |  |
Shares issued for restricted stock awards, shares | 2,004,212 | 2,099,865 | 1,683,564
Issuance of preferred stock, shares | 40,625,000 |  |
RETAINED EARNINGS (ACCUMULATED DEFICIT): |  |  |
Dividends paid on common stock, per share | $ 0.68 | $ 0.68 | $ 1.00
Dividends paid on preferred stock, per share | $ 47.81 |  |
TREASURY STOCK: |  |  |
Purchase of common stock, shares | 1,284,373 | 566,584 | 448,223
Shares issued for restricted stock awards, shares | 713,837 | 580,087 | 495,777

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