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Net Income per Unit
 9 Months Ended
Sep. 30, 2015
Earnings Per Unit [Abstract]  
Net Income per Unit
Net Income per Unit

Basic net income per unit is derived by reducing net income for the 1% general partnership interest and dividing the remaining 99% by the basic weighted average number of units outstanding for each period. Diluted net income per unit is derived by reducing net income for the 1% general partnership interest and dividing the remaining 99% by the total of the diluted weighted average number of units outstanding for each period.

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
(in thousands, except per unit amounts)
 
 
 
 
 
 
 
 
Net income attributable to AB Unitholders
$
134,976

 
$
139,798

 
$
425,539

 
$
392,958

 
 
 
 
 
 
 
 
Weighted average units outstanding – basic
271,911

 
269,372

 
272,530

 
268,874

Dilutive effect of compensatory options to buy AB Holding Units
970

 
1,249

 
1,113

 
1,174

Weighted average units outstanding – diluted
272,881

 
270,621

 
273,643

 
270,048

Basic net income per AB Unit
$
0.49

 
$
0.51

 
$
1.55

 
$
1.45

Diluted net income per AB Unit
$
0.49

 
$
0.51

 
$
1.54

 
$
1.44



For the three and nine months ended September 30, 2015, we excluded 2,771,250 and 2,383,589 options, respectively, from the diluted net income per unit computation due to their anti-dilutive effect. For the three and nine months ended September 30, 2014, we excluded 2,774,117 and 2,806,033 options, respectively, from the diluted net income per unit computation due to their anti-dilutive effect.