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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Activity | The following table presents restricted stock activity for the years 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
| # of Shares |  | Weighted Average Fair Value at Date of Grant |  | # of Shares |  | Weighted Average Fair Value at Date of Grant |  | # of Shares |  | Weighted Average Fair Value at Date of Grant
Nonvested restricted shares outstanding at January 1 | 224,289 |  |  | $ | 41.30 |  |  | 197,674 |  |  | $ | 43.56 |  |  | 366,363 |  |  | $ | 38.24 |
Granted | 216,017 |  |  | 36.03 |  |  | 150,647 |  |  | 39.47 |  |  | 107,346 |  |  | 45.34 |
Forfeited | (29,150 | ) |  | 42.50 |  |  | (51,234 | ) |  | 43.56 |  |  | (39,322 | ) |  | 40.93 |
Vested | (127,818 | ) |  | 41.06 |  |  | (72,798 | ) |  | 42.06 |  |  | (236,713 | ) |  | 36.57 |
Nonvested restricted shares outstanding at December 31 | 283,338 |  |  | $ | 37.26 |  |  | 224,289 |  |  | $ | 41.30 |  |  | 197,674 |  |  | $ | 43.56 |
Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation | A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Numerator (basic and diluted): |  |  |  |  |
Net income | $ | 34.5 |  |  | $ | 82.8 |  |  | $ | 89.7 |
Less: Dividends paid to participating securities | (0.4 | ) |  | (0.3 | ) |  | (0.2 | )
Less: Undistributed earnings available to participating securities | — |  |  | (0.2 | ) |  | (0.3 | )
Undistributed and distributed earnings available to common stockholders | $ | 34.1 |  |  | $ | 82.3 |  |  | $ | 89.2 |
Denominator: |  |  |  |  |
Average number of common shares outstanding | 30,407.1 |  |  | 30,310.9 |  |  | 30,251.4 |
Effect of dilutive stock-based compensation | 142.2 |  |  | 152.5 |  |  | 122.9 |
Average number of common and potential common shares outstanding | 30,549.3 |  |  | 30,463.4 |  |  | 30,374.3 |

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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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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