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Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Weighted Average Number of Common Shares Outstanding | The weighted average number of common shares outstanding is calculated as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Weighted average shares outstanding—basic |  |  | 51,303 |  |  |  | 51,154 |  |  |  | 51,259 |  |  |  | 51,100 |
Effect of dilutive stock-based compensation |  |  | 173 |  |  |  | 180 |  |  |  | 200 |  |  |  | 216 |
Weighted average shares outstanding—diluted |  |  | 51,476 |  |  |  | 51,334 |  |  |  | 51,459 |  |  |  | 51,316 |

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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://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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