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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Dilutive Net Income Per Share | The following table presents the computation of basic and diluted earnings per common share for the periods indicated (dollar and share amounts in thousands, except per share amounts):
|  | Twelve Months Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Basic Earnings per Common Share |  |  |  |  |  |
Net income attributable to Company |  | $ | 91,980 |  |  | $ | 67,551 |  |  | $ | 78,013 |
Less: Preferred stock dividends |  | (15,660 | ) |  | (12,900 | ) |  | (10,990 | )
Net income attributable to Company's common stockholders |  | $ | 76,320 |  |  | $ | 54,651 |  |  | $ | 67,023 |
Basic weighted average common shares outstanding |  | 111,836 |  |  | 109,594 |  |  | 108,399 |
Basic Earnings per Common Share |  | $ | 0.68 |  |  | $ | 0.50 |  |  | $ | 0.62 |
Diluted Earnings per Common Share: |  |  |  |  |  |
Net income attributable to Company |  | $ | 91,980 |  |  | $ | 67,551 |  |  | $ | 78,013 |
Less: Preferred stock dividends |  | (15,660 | ) |  | (12,900 | ) |  | (10,990 | )
Add back: Interest expense on convertible notes for the period, net of tax |  | 9,158 |  |  | — |  |  | — |
Net income attributable to Company's common stockholders |  | $ | 85,478 |  |  | $ | 54,651 |  |  | $ | 67,023 |
Weighted average common shares outstanding |  | 111,836 |  |  | 109,594 |  |  | 108,399 |
Net effect of assumed convertible notes conversion to common shares |  | 18,507 |  |  | — |  |  | — |
Diluted weighted average common shares outstanding |  | 130,343 |  |  | 109,594 |  |  | 108,399 |
Diluted Earnings per Common Share |  | $ | 0.66 |  |  | $ | 0.50 |  |  | $ | 0.62 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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