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Earnings per Common Share (Tables) | 6 Months Ended
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Jun. 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 six month periods ended June 30, 2018 and 2017:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 | 2017 |  | 2018 | 2017
Net income | $ | 41.7 |  | $ | 21.8 |  |  | $ | 78.4 |  | $ | 45.0 |
Weighted average common shares outstanding for basic earnings per share computation | 56,335,186 |  | 47,612,971 |  |  | 56,288,453 |  | 46,170,500 |
Dilutive effects of stock-based compensation | 363,835 |  | 461,480 |  |  | 381,947 |  | 510,875 |
Weighted average common shares outstanding for diluted earnings per common share computation | 56,699,021 |  | 48,074,451 |  |  | 56,670,400 |  | 46,681,375 |
Basic earnings per common share | $ | 0.74 |  | $ | 0.46 |  |  | $ | 1.39 |  | $ | 0.97 |
Diluted earnings per common share | $ | 0.74 |  | $ | 0.45 |  |  | $ | 1.38 |  | $ | 0.96 |
Anti-dilutive unvested time restricted stock | 85 |  | 96,262 |  |  | 128,461 |  | 92,626 |

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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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