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Earnings Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Weighted Average Number of Shares | The table below reconciles the weighted-average basic and diluted common shares outstanding:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Weighted average number of common shares outstanding - basic | 74,019 |  |  | 73,461 |  |  | 73,972 |  |  | 73,272 |
Effect of dilutive securities (1) | 560 |  |  | 1,077 |  |  | 626 |  |  | 980 |
Weighted average number of common shares outstanding - diluted | 74,579 |  |  | 74,538 |  |  | 74,598 |  |  | 74,252 |
(1) | Certain outstanding equity awards are anti-dilutive and were therefore excluded from the calculation of the weighted average number of diluted common shares outstanding. During the three and nine months ended September 30, 2018, stock options to purchase 0.6 million shares having a weighted average exercise price of $42.79 and $42.70 per share, respectively, were excluded. During the three months ended September 30, 2017, there were no anti-dilutive stock options, and during the nine months ended September 30, 2017, stock options to purchase 0.5 million shares having a weighted average exercise price of $39.38 per share were excluded. During the three and nine months ended September 30, 2018, 0.1 million restricted stock units were excluded. During the three and nine months ended September 30, 2017, there were no anti-dilutive restricted stock units.

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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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