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NET INCOME PER SHARE
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
NET INCOME PER SHARE
NET INCOME PER SHARE
 
The Company computes basic net income per share by dividing net income by the weighted average number of common shares outstanding during the period.  Diluted net income per share is based upon the weighted average number of common and common equivalent shares outstanding during the period.
 
Common equivalent shares related to stock options, restricted stock units and performance share units are calculated using the treasury stock method.  Performance share units are included in the weighted average common equivalent shares based on the number of shares that would be issued if the end of the reporting period were the end of the performance period, if the result would be dilutive.
 
The Company's convertible debt issues have net share settlement features requiring the Company upon conversion to settle the principal amount of the debt for cash and the conversion premium for cash or shares of the Company's common stock, at the Company's option.  The convertible notes are included in the calculation of diluted net income per share if their inclusion is dilutive under the treasury stock method.
 
A reconciliation of the weighted average number of shares outstanding used in calculating diluted earnings per share is as follows (in thousands): 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2014
 
2013
 
2014
 
2013
Weighted average number of basic common shares outstanding
 
52,405

 
51,363

 
52,319

 
50,690

Weighted average dilutive stock options, restricted stock units and performance share units
 
272

 
338

 
308

 
359

Assumed conversion of Convertible Senior Notes
 
347

 
1,283

 
421

 
1,177

Weighted average number of diluted common and common equivalent shares outstanding
 
53,024

 
52,984

 
53,048

 
52,226

Anti-dilutive potential common shares
 
2,628

 
2,923

 
2,577

 
2,931


 
Anti-dilutive potential common shares for the nine months ended September 30, 2014 include approximately 2.1 million shares that could be issued under the Company's outstanding convertible notes.  Under the treasury stock method, the convertible notes will generally have a dilutive impact on net income per share if the Company's average stock price for the period exceeds the conversion price for the convertible notes.