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Earnings per share (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Weighted Average Number of Shares Outstanding Reconciliation
Weighted average number of common shares outstanding used to compute basic earnings per share	53,620	52,131	53,350	44,777
Dilutive effect of stock-based awards	1,004	1,031	1,044	1,030
Number of shares used to compute diluted earnings per share	54,624	53,162	54,394	45,807

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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