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Earnings per share (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Weighted Average Number of Shares Outstanding Reconciliation
Weighted average number of common shares outstanding used to compute basic earnings per share	53,481	46,739	36,876
Dilutive effect of stock-based awards	1,074	1,087	882
Number of shares used to compute diluted earnings per share	54,555	47,826	37,758
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive common share equivalents outstanding	7	83	1,039

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