Net Income per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Computation of basic and diluted net income per common share

The following table summarizes the computation of basic and diluted net income per common share (in thousands, except per share amounts):

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Net income attributable to ION	$	56,069	$	1,188	$	805	$	77,167
Weighted average number of common shares outstanding	164,693		164,063		164,630		163,956
Effect of dilutive stock awards	19		360		21		287
Weighted average number of diluted common shares outstanding	164,712		164,423		164,651		164,243
Basic net income per share	$	0.34	$	0.01	$	0.00	$	0.47
Diluted net income per share	$	0.34	$	0.01	$	0.00	$	0.47