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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2012
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,
|  | 2012 |  | 2011 |  | 2010
Weighted average number of common shares |  | 46,739 |  |  | 36,876 |  |  | 36,429 |
Dilutive effect of stock-based awards |  | 1,087 |  |  | 882 |  |  | 621 |
Number of shares used to compute diluted earnings per share |  | 47,826 |  |  | 37,758 |  |  | 37,050 |
Schedule of Weighted Average Share Equivalents Outstanding Excluded from Computation of Diluted Earnings per Share | Also excluded from the computation of diluted earnings per share were other share equivalents that became anti-dilutive when applying the treasury stock method.
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Anti-dilutive common share equivalents outstanding |  | 83 |  |  | 1,039 |  |  | 1,339 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 (c) -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Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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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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