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Earnings per share | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Earnings per share | 11. Earnings Per Share The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Weighted average number of common shares outstanding used to compute basic earnings per share | 52,654 |  |  | 53,374 |  |  | 52,053 |  |  | 53,955 |
Dilutive effect of stock-based awards | 650 |  |  | 755 |  |  | 706 |  |  | 849 |
Number of shares used to compute diluted earnings per share | 53,304 |  |  | 54,129 |  |  | 52,759 |  |  | 54,804 |
The amount of anti-dilutive share equivalents outstanding during the three and nine months ended September 30, 2015 and 2014 was insignificant.

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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 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 2: 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 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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