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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Schedule of Reconciliation of Earnings Per Share |
2015 |  | Income |  | Shares |  | Per Share
($ in thousands, except per share amounts) |  | (Numerator) |  | (Denominator) |  | Amount
Basic EPS: |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 165,861 |  |  | 57,212 |  |  | $ | 2.90 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
Stock compensation plans |  | — |  |  | 944 |  |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 165,861 |  |  | 58,156 |  |  | $ | 2.85 |
2014 |  | Income |  | Shares |  | Per Share
($ in thousands, except per share amounts) |  | (Numerator) |  | (Denominator) |  | Amount
Basic EPS: |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 141,827 |  |  | 56,310 |  |  | $ | 2.52 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
Stock compensation plans |  | — |  |  | 1,041 |  |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 141,827 |  |  | 57,351 |  |  | $ | 2.47 |
2013 |  | Income |  | Shares |  | Per Share
($ in thousands, except per share amounts) |  | (Numerator) |  | (Denominator) |  | Amount
Basic EPS: |  |  |  |  |  |  |  |  |
Net income from continuing operations |  | $ | 107,415 |  |  | 55,638 |  |  | $ | 1.93 |
Net loss from discontinued operations |  | (997 | ) |  | 55,638 |  |  | (0.02 | )
Net income available to common stockholders |  | $ | 106,418 |  |  | 55,638 |  |  | $ | 1.91 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
Stock compensation plans |  | — |  |  | 1,172 |  |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |
Net income from continuing operations |  | $ | 107,415 |  |  | 56,810 |  |  | $ | 1.89 |
Net loss from discontinued operations |  | (997 | ) |  | 56,810 |  |  | (0.02 | )
Net income available to common stockholders |  | $ | 106,418 |  |  | 56,810 |  |  | $ | 1.87 |

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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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