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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2014
Earnings Per Share [Abstract] |
Summary of Numerator and Denominator of Basic and Fully Diluted Earnings Per Common Share | A summary of the numerator and denominator of the basic and diluted earnings per common share is presented below:
|  | Three Months Ended March 31, 2014 |  |  | Three Months Ended March 31, 2013 |
|  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |  |  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
Net income |  | $ | 17,620 |  |  |  |  |  |  |  |  |  |  | $ | 20,387 |  |  |  |  |  |  |  |  |
Less: Preferred stock dividends |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  | (34 | ) |  |  |  |  |  |  |  |
Less: Income attributable to participating securities |  |  | (1,180 | ) |  |  |  |  |  |  |  |  |  |  | (459 | ) |  |  |  |  |  |  |  |
Basic Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income allocated to common stockholders |  |  | 16,443 |  |  |  | 10,261 |  |  | $ | 1.60 |  |  |  | 19,894 |  |  |  | 10,650 |  |  | $ | 1.87 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | — |  |  |  | 149 |  |  |  |  |  |  |  | — |  |  |  | 159 |  |  |  |  |
Convertible preferred stock |  |  | (3 | ) |  |  | 79 |  |  |  |  |  |  |  | 34 |  |  |  | 222 |  |  |  |  |
Convertible senior notes |  |  | 1,071 |  |  |  | 1,649 |  |  |  |  |  |  |  | — |  |  |  | — |  |  |  |  |
Diluted Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders and assumed conversions |  | $ | 17,511 |  |  |  | 12,138 |  |  | $ | 1.44 |  |  | $ | 19,928 |  |  |  | 11,031 |  |  | $ | 1.81 |

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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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