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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share | The following table provides a reconciliation of the common shares used for basic net income per share to the diluted shares used for diluted net income per share:
Year Ended December 31, | 2017 |  | 2016 |  | 2015
Basic weighted average shares outstanding | 45,367,932 |  |  | 45,212,414 |  |  | 45,173,542 |
Effect of potential dilutive shares(1): |  |  |  |  |
Warrants | — |  |  | 312,619 |  |  | 809,834 |
Stock options | — |  |  | 447 |  |  | 5,313 |
Restricted stock units | — |  |  | 116,105 |  |  | 14,221 |
Performance stock units | — |  |  | 81,939 |  |  | 3,117 |
Diluted weighted average shares outstanding | 45,367,932 |  |  | 45,723,524 |  |  | 46,006,027 |
Anti-dilutive shares excluded from the above reconciliation |  |  |  |  |
Stock options | 126,667 |  |  | 110,000 |  |  | 110,000 |
Warrants | 4,053,670 |  |  | — |  |  | — |
Restricted stock units | 68,654 |  |  | — |  |  | — |
Performance stock units (2) | 322,943 |  |  | — |  |  | — |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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