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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2017
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 2017, 2016 and 2015:
| Year Ended December 31, 2017
| 2017 |  | 2016 |  | 2015
| (in thousands)
Weighted average number of common shares outstanding - basic | 73,355 |  |  | 72,754 |  |  | 71,826 |
Effect of dilutive securities (1) | 993 |  |  | 720 |  |  | 686 |
Weighted average number of common shares outstanding - diluted | 74,348 |  |  | 73,474 |  |  | 72,512 |
(1) Certain outstanding stock option 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, 2017, options to purchase less than a thousand shares, having a weighted average exercise price of $39.38, were excluded from the computation. For the years ended December 2016 and 2015, the computation excluded options to purchase 0.5 million and 0.9 million shares, having weighted average exercise prices of $34.14 and $29.34, 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://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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