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Net Income Per Share and Stockholders' Equity | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Net Income Per Share and Stockholders' Equity | Net Income Per Share Basic net income per share is computed by dividing distributed and undistributed net income allocable to common shares by the weighted-average number of common shares outstanding during the applicable period. The basic weighted-average number of common shares outstanding during the period excludes non-vested share-based payment awards. Diluted net income per share was calculated under the treasury stock method for 2019, 2018 and 2017, which in all years was more dilutive than the two-class method. The following table sets forth the computation of basic and diluted net income per share for the periods presented (in millions of dollars, except share and per share amounts):
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Net income |  | $ | 62.0 |  |  | $ | 91.7 |  |  | $ | 45.4 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |
Basic |  | 15,997 |  |  | 16,585 |  |  | 16,996 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares 1 |  | 206 |  |  | 289 |  |  | 263 |
Diluted |  | 16,203 |  |  | 16,874 |  |  | 17,259 |
Net income per common share, Basic: |  | $ | 3.88 |  |  | $ | 5.53 |  |  | $ | 2.67 |
Net income per common share, Diluted: |  | $ | 3.83 |  |  | $ | 5.43 |  |  | $ | 2.63 |
____________ 1. A total of 52,000 non-vested RSAs, RSUs and performance shares for the year ended December 31, 2017 were excluded from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive. None were excluded for the years ended December 31, 2019 and December 31, 2018.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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