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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2015
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 (share amounts in thousands):
|  | Three Months Ended June 30, 2015 |  |  | Three Months Ended June 30, 2014 |
|  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |  |  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
Net income |  | $ | 22,022 |  |  |  |  |  |  |  |  |  |  | $ | 16,430 |  |  |  |  |  |  |  |  |
Less: Preferred stock dividends |  |  | — |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Less: Income attributable to participating securities |  |  | (1,231 | ) |  |  |  |  |  |  |  |  |  |  | (1,203 | ) |  |  |  |  |  |  |  |
Basic Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income allocated to common stockholders |  |  | 20,791 |  |  |  | 9,580 |  |  | $ | 2.17 |  |  |  | 15,228 |  |  |  | 9,925 |  |  | $ | 1.53 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | — |  |  |  | 115 |  |  |  |  |  |  |  | — |  |  |  | 133 |  |  |  |  |
Convertible preferred stock |  |  | — |  |  |  | — |  |  |  |  |  |  |  | (1 | ) |  |  | 3 |  |  |  |  |
Convertible senior notes |  |  | 1,121 |  |  |  | 1,650 |  |  |  |  |  |  |  | 1,081 |  |  |  | 1,649 |  |  |  |  |
Diluted Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders and assumed conversions |  | $ | 21,912 |  |  |  | 11,345 |  |  | $ | 1.93 |  |  | $ | 16,308 |  |  |  | 11,710 |  |  | $ | 1.39 |
|  | Six Months Ended June 30, 2015 |  |  | Six Months Ended June 30, 2014 |
|  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |  |  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
Net income |  | $ | 47,400 |  |  |  |  |  |  |  |  |  |  | $ | 34,050 |  |  |  |  |  |  |  |  |
Less: Preferred stock dividends |  |  | — |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
Less: Income attributable to participating securities |  |  | (2,730 | ) |  |  |  |  |  |  |  |  |  |  | (2,386 | ) |  |  |  |  |  |  |  |
Basic Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income allocated to common stockholders |  |  | 44,670 |  |  |  | 9,560 |  |  | $ | 4.67 |  |  |  | 31,668 |  |  |  | 10,092 |  |  | $ | 3.14 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | — |  |  |  | 125 |  |  |  |  |  |  |  | — |  |  |  | 141 |  |  |  |  |
Convertible preferred stock |  |  | — |  |  |  | — |  |  |  |  |  |  |  | (4 | ) |  |  | 41 |  |  |  |  |
Convertible senior notes |  |  | 2,231 |  |  |  | 1,649 |  |  |  |  |  |  |  | 2,152 |  |  |  | 1,649 |  |  |  |  |
Diluted Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders and assumed conversions |  | $ | 46,901 |  |  |  | 11,334 |  |  | $ | 4.14 |  |  | $ | 33,816 |  |  |  | 11,923 |  |  | $ | 2.84 |

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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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