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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Net Earnings Per Share | The table below reconciles the weighted-average basic and diluted common shares outstanding for 2018, 2017 and 2016:
| Year Ended December 31, 2018 |  |  |  |
| 2018 |  | 2017 |  | 2016
| (in thousands) |  |  |  |
Weighted average number of common shares outstanding - basic | 74,002 |  | 73,355 |  | 72,754
Effect of dilutive securities 1 | 610 |  | 993 |  | 720
Weighted average number of common shares outstanding - diluted | 74,612 |  | 74,348 |  | 73,474
1Certain outstanding equity awards are anti-dilutive and were therefore excluded from the calculation of the weighted average number of diluted common shares outstanding. For the year ended December 31, 2018, 2017 and 2016, options to purchase 0.6 million, less than 0.1 million shares and 0.5 million shares were excluded from the calculation of weighted average number of diluted common shares outstanding, respectively. The per share exercise prices of such awards were $42.84, $39.38 and $34.14, respectively.

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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://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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