Earnings per share (Tables)

6 Months Ended

Jun. 30, 2014

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):

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2014	2013	2014	2013
Weighted average number of common shares outstanding used to compute basic earnings per share	54,372	53,378	54,239	53,213
Dilutive effect of stock-based awards	801	949	859	1,009
Number of shares used to compute diluted earnings per share	55,173	54,327	55,098	54,222