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Earnings Per Common Share | 9 Months Ended
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Sep. 30, 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:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Weighted average number of common shares outstanding - basic | 73,461 |  |  | 72,839 |  |  | 73,272 |  |  | 72,718 |
Effect of dilutive securities (1) | 1,077 |  |  | 753 |  |  | 980 |  |  | 717 |
Weighted average number of common shares outstanding - diluted | 74,538 |  |  | 73,592 |  |  | 74,252 |  |  | 73,435 |
(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. During the three months ended September 30, 2017, there were no anti-dilutive stock options excluded and during the nine months ended September 30, 2017, 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, 2016, options to purchase 0.5 million shares having a weighted average exercise price of $34.14 per share were excluded.

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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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