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Common and Common Equivalent Shares: (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Share | The calculation of shares used in the basic and diluted net income per share calculation for the years ended December 31, 2012, 2011 and 2010 is as follows (in thousands):
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Weighted average number of common shares outstanding |  |  | 48,693 |  |  |  | 47,706 |  |  |  | 46,630 |
Weighted average number of dilutive common share equivalents |  |  | 998 |  |  |  | 1,090 |  |  |  | 940 |
Weighted average number of common and common equivalent shares outstanding |  |  | 49,691 |  |  |  | 48,796 |  |  |  | 47,570 |
Antidilutive securities not included in the diluted earnings per share calculation |  |  | 29 |  |  |  | 45 |  |  |  | 464 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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