Per Share Data

The calculations of basic and diluted net income (loss) per share for each of the three years ended September 30, 2012, 2011 and 2010 are as follows:



	Years Ended September 30,
	2012			2011		2010
	(in thousands, except per share data)
Numerator for basic and diluted net income (loss) per share:
Net income (loss)	$	(2,718	)	$	55,957	$	42,196
Denominator for basic net income (loss) per share:
Weighted average common shares outstanding	27,120			26,568		25,603
Dilutive effect of stock options and awards	—			1,740		1,438
Denominator for diluted net income (loss) per share	27,120			28,308		27,041
Basic net income (loss) per share	$	(0.10	)	$	2.11	$	1.65
Diluted net income (loss) per share	$	(0.10	)	$	1.98	$	1.56

The diluted earnings per share calculation for the year ended September 30, 2012 does not include approximately 1,781,000 potential common shares from outstanding stock options and awards because their inclusion would be anti-dilutive. For the years ended September 30, 2012, 2011, and 2010, an additional 1,499,000, 1,115,000 and 589,000 stock options and awards were excluded from diluted earnings per share by the application of the treasury stock method.