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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 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):
|  | Year Ended December 31,
|  | 2015 |  | 2014 |  | 2013
Weighted average number of common shares outstanding used to compute basic earnings per share |  | 52,259 |  |  | 53,437 |  |  | 53,481 |
Dilutive effect of stock-based awards |  | 746 |  |  | 857 |  |  | 1,074 |
Number of shares used to compute diluted earnings per share |  | 53,005 |  |  | 54,294 |  |  | 54,555 |

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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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