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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Reconciliation of Shares Used to Compute Basic and Diluted 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 |  | Six Months Ended
| June 30, |  | June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Weighted average number of common shares outstanding used to compute basic earnings per share | 51,978 |  |  | 54,372 |  |  | 51,749 |  |  | 54,239 |
Dilutive effect of stock-based awards | 655 |  |  | 801 |  |  | 686 |  |  | 859 |
Number of shares used to compute diluted earnings per share | 52,633 |  |  | 55,173 |  |  | 52,435 |  |  | 55,098 |

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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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