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Earnings per share (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Weighted Average Number of Shares Outstanding Reconciliation
Weighted average number of common shares outstanding used to compute basic earnings per share	53,378	44,852	53,213	41,060
Dilutive effect of stock-based awards	949	1,027	1,009	1,007
Number of shares used to compute diluted earnings per share	54,327	45,879	54,222	42,067

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- Definition

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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