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Earnings Per Common Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Common Share | Earnings Per Common Share Basic and diluted earnings per common share are computed by dividing net income by the weighted-average number of basic and diluted common shares outstanding, respectively. The weighted-average number of diluted common shares includes the impact of dilutive securities, including outstanding stock options and unvested restricted stock and restricted stock units. 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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