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Earnings Per Share | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Earnings Per Share | Note 10 — Earnings Per Share U.S. GAAP requires the Company to use the two-class method in computing basic earnings per share since holders of the Company’s restricted stock have the right to share in dividends, if declared, equally with common stockholders. These participating securities affect the computation of both basic and diluted earnings per share during periods of net income. 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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