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Earnings per share (Details) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Weighted Average Number of Shares Outstanding Reconciliation |  |  |  |
Weighted average number of common shares outstanding used to compute basic earnings per share | 52,131 | 37,001 | 44,777 | 36,866
Dilutive effect of stock-based awards | 1,031 | 768 | 1,030 | 890
Number of shares used to compute diluted earnings per share | 53,162 | 37,769 | 45,807 | 37,756
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |
Anti-dilutive common share equivalents outstanding | 170 | 1,385 | 49 | 1,059

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