The following table sets forth the components of basic and diluted earnings (loss) per share (in thousands): 
  
| 
   
 | 
   
 | 
 Three Months 
Ended March 31, 
 | 
   
 | 
 Six Months 
Ended March 31, 
 | 
   
 | 
 
| 
   
 | 
   
 | 
 2013 
 | 
   
 | 
 2012 
 | 
   
 | 
 2013 
 | 
   
 | 
 2012 
 | 
   
 | 
 
| 
 Numerator: 
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
 
| 
 Income from continuing operations 
 | 
   
 | 
 $ 
 | 
 31,714 
 | 
   
 | 
 $ 
 | 
 14,211 
 | 
   
 | 
 $ 
 | 
 53,497 
 | 
   
 | 
 $ 
 | 
 31,869 
 | 
   
 | 
 
| 
 Income (loss) from discontinued operations 
 | 
   
 | 
 (25 
 | 
 ) 
 | 
 62 
 | 
   
 | 
 (492 
 | 
 ) 
 | 
 108 
 | 
   
 | 
 
| 
 Net income 
 | 
   
 | 
 $ 
 | 
 31,689 
 | 
   
 | 
 $ 
 | 
 14,273 
 | 
   
 | 
 $ 
 | 
 53,005 
 | 
   
 | 
 $ 
 | 
 31,977 
 | 
   
 | 
 
| 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
 
| 
 Denominator: 
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
 
| 
 Basic weighted average shares outstanding 
 | 
   
 | 
 34,089 
 | 
   
 | 
 33,788 
 | 
   
 | 
 34,085 
 | 
   
 | 
 33,725 
 | 
   
 | 
 
| 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
 
| 
 Effect of dilutive securities: 
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
   
 | 
 
| 
 Employee stock options and unvested restricted stock units 
 | 
   
 | 
 865 
 | 
   
 | 
 940 
 | 
   
 | 
 832 
 | 
   
 | 
 913 
 | 
   
 | 
 
| 
 Denominator for diluted earnings (loss) per share 
 | 
   
 | 
 34,954 
 | 
   
 | 
 34,728 
 | 
   
 | 
 34,917 
 | 
   
 | 
 34,638 
 | 
   
 | 
 
 
 
 |