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Net Income (Loss) Per Share and Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Calculation of basic and diluted earnings per share | Basic and diluted net income (loss) per share for 2016, 2015 and 2014 were calculated as follows (in millions of dollars, except share and per share amounts):
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Numerator: |  |  |  |  |  |  |
Net income (loss) |  | $ | 91.7 |  |  | $ | (236.6 | ) |  | $ | 71.8 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |
Basic 1 |  | 17,813 |  |  | 17,201 |  |  | 17,818 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares |  | 220 |  |  | — |  |  | 179 |
Add: dilutive effect of warrants 2 |  | — |  |  | — |  |  | 596 |
Diluted 3 |  | 18,033 |  |  | 17,201 |  |  | 18,593 |
Net income (loss) per common share, Basic: |  | $ | 5.15 |  |  | $ | (13.76 | ) |  | $ | 4.02 |
Net income (loss) per common share, Diluted: |  | $ | 5.09 |  |  | $ | (13.76 | ) |  | $ | 3.86 |
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1. | The basic weighted-average number of common shares outstanding during the periods presented excludes non-vested common shares, restricted stock units and performance shares.
2. | Net-share-settled warrants ("Warrants") relating to approximately 3.7 million notional common shares of our common stock were outstanding at December 31, 2014 at an exercise price of approximately $60.70 per share, and were settled during a period from July 1, 2015 through December 18, 2015. In total, we issued 1,015,185 shares of our common stock in connection with the Warrants and paid a de minimis amount in cash to the holders for fractional shares at the end of the settlement period.
3. | The diluted weighted-average number of common shares outstanding during the periods presented was calculated using the treasury method.
Schedule of securities excluded from weighted-average diluted shares | The following securities were excluded from the weighted-average diluted shares computation for 2016, 2015 and 2014 as their inclusion would have been anti-dilutive (in thousands of shares):
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Options to purchase common shares |  | — |  |  | — |  |  | 17 |
Non-vested common shares, restricted stock units and performance shares |  | 50 |  |  | 302 |  |  | — |
Warrants |  | — |  |  | 639 |  |  | — |
Total excluded |  | 50 |  |  | 941 |  |  | 17 |
Treasury Stock | Repurchases of our common stock pursuant to the stock repurchase program is recorded as Treasury stock and consisted of the following for each period presented:
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Number of common shares repurchased |  | 443,838 |  |  | 647,520 |  |  | 633,230 |
Weighted-average repurchase price (dollars per share) |  | $ | 78.59 |  |  | $ | 76.35 |  |  | $ | 70.87 |
Total cost of repurchased common shares (in millions of dollars) |  | $ | 34.9 |  |  | $ | 49.4 |  |  | $ | 44.9 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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 The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References No definition available. + Details
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