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Net Income per Unit
 6 Months Ended
Jun. 30, 2016
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 June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
 
(in thousands, except per unit amounts)
 
 
 
 
 
 
 
 
Net income attributable to AB Unitholders
$
127,144

 
$
149,094

 
$
296,070

 
$
290,563

 
 
 
 
 
 
 
 
Weighted average units outstanding – basic
269,720

 
272,858

 
270,787

 
272,844

Dilutive effect of compensatory options to buy AB Holding Units
650

 
1,253

 
534

 
1,184

Weighted average units outstanding – diluted
270,370

 
274,111

 
271,321

 
274,028

Basic net income per AB Unit
$
0.47

 
$
0.54

 
$
1.08

 
$
1.05

Diluted net income per AB Unit
$
0.47

 
$
0.54

 
$
1.08

 
$
1.05



For the three and six months ended June 30, 2016, we excluded 2,793,454 and 2,873,106 options, respectively, from the diluted net income per unit computation due to their anti-dilutive effect. For the three and six months ended June 30, 2015, we excluded 2,383,589 options from the diluted net income per unit computation due to their anti-dilutive effect.