Earnings per share (Tables)

6 Months Ended

Jun. 30, 2015

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,
	2015	2014	2015	2014
Weighted average number of common shares outstanding used to compute basic earnings per share	51,978	54,372	51,749	54,239
Dilutive effect of stock-based awards	655	801	686	859
Number of shares used to compute diluted earnings per share	52,633	55,173	52,435	55,098