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Common and Common Equivalent Shares | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Common and Common Equivalent Shares | 12. Common and Common Equivalent Shares: The calculation of shares used in the basic and diluted net income per share calculation for the years ended December 31, 2017, 2016 and 2015 is as follows (in thousands):
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted average number of common shares outstanding |  |  | 92,431 |  |  |  | 92,422 |  |  |  | 93,077 |
Weighted average number of dilutive common share equivalents |  |  | 527 |  |  |  | 687 |  |  |  | 883 |
Weighted average number of common and common equivalent shares outstanding |  |  | 92,958 |  |  |  | 93,109 |  |  |  | 93,960 |
Antidilutive securities not included in the diluted net income per common share calculation |  |  | 107 |  |  |  | 2 |  |  |  | — |

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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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