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Common and Common Equivalent Shares: | 12 Months Ended
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Dec. 31, 2012
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, 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 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 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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