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Earnings per share | 6 Months Ended
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Jun. 30, 2014
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share. Basic earnings per share are computed based upon the weighted average number of common shares outstanding. Diluted earnings per share are computed based upon the weighted average number of common shares outstanding and dilutive common share equivalents (consisting of stock options, restricted stock units and employee stock purchase plan shares) outstanding during the periods using the treasury stock method. The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
Weighted average number of common shares outstanding used to compute basic earnings per share | 54,372 |  |  | 53,378 |  |  | 54,239 |  |  | 53,213 |
Dilutive effect of stock-based awards | 801 |  |  | 949 |  |  | 859 |  |  | 1,009 |
Number of shares used to compute diluted earnings per share | 55,173 |  |  | 54,327 |  |  | 55,098 |  |  | 54,222 |
There were 182,000 and 107,000 weighted average share equivalents outstanding during the three and six months ended June 30, 2013, respectively, that were excluded from the computation of diluted earnings per share that were anti-dilutive when applying the treasury stock method. There were no significant share equivalents outstanding during the three and six months ended June 30, 2014 that became anti-dilutive when applying the treasury stock method.

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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 Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: 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 4: 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=32703322&loc=d3e4984-109258 Reference 5: 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=26872669&loc=d3e20235-122688 + Details
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