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NET INCOME PER SHARE | 6 Months Ended
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Jun. 30, 2013
NET INCOME PER SHARE |
NET INCOME PER SHARE | 9. NET INCOME PER SHARE For the three and six months ended June 30, 2012 and 2013, outstanding stock options were the only potentially dilutive securities. The reconciliation from basic to diluted weighted average common shares outstanding is as follows (in thousands):
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |
|  | 2012 |  | 2013 |  | 2012 |  | 2013 |
Basic weighted-average common shares outstanding |  | 15,535 |  | 15,706 |  | 15,495 |  | 15,647 |
Stock options |  | 74 |  | 115 |  | 86 |  | 109 |
Diluted weighted-average common shares outstanding |  | 15,609 |  | 15,821 |  | 15,581 |  | 15,756 |
The above calculations for the three months ended June 30, 2012 and 2013 do not include 381,000 and 60,000 shares, respectively, related to certain stock options because the effects of such were anti-dilutive. For the six months ended June 30, 2012 and 2013, the calculation does not include 353,000 and 153,000 shares, respectively, related to certain stock options because the effect of such options was anti-dilutive.

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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 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: 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 Reference 4: 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 5: 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 6: 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 + Details
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