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Income Per Share (Tables) | 9 Months Ended
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Sep. 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 |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Weighted average shares outstanding - basic |  | 51,325 |  | 51,191 |  | 51,281 |  | 51,131
Effect of dilutive stock-based compensation |  | 194 |  | 185 |  | 195 |  | 200
Weighted average shares outstanding - diluted |  | 51,519 |  | 51,376 |  | 51,476 |  | 51,331

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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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