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Earnings per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share | The following table sets forth the computation of basic and diluted earnings per share for the three and nine month periods ended September 30, 2018 and 2017:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 | 2017 |  | 2018 | 2017
Net income | $ | 41.4 |  | $ | 27.3 |  |  | $ | 119.8 |  | $ | 72.3 |
Weighted average common shares outstanding for basic earnings per share computation | 58,254,575 |  | 56,094,401 |  |  | 56,951,029 |  | 49,514,818 |
Dilutive effects of stock-based compensation | 385,900 |  | 436,467 |  |  | 378,998 |  | 486,064 |
Weighted average common shares outstanding for diluted earnings per common share computation | 58,640,475 |  | 56,530,868 |  |  | 57,330,027 |  | 50,000,882 |
Basic earnings per common share | $ | 0.71 |  | $ | 0.49 |  |  | $ | 2.10 |  | $ | 1.46 |
Diluted earnings per common share | $ | 0.71 |  | $ | 0.48 |  |  | $ | 2.09 |  | $ | 1.45 |
Anti-dilutive unvested time restricted stock | 4,376 |  | — |  |  | 120,553 |  | 94,210 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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