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Net Income Per Unit
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [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 year. 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 year.
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(in thousands, except per unit amounts)
Net income attributable to AB Unitholders
$
662,403

 
$
673,358

 
$
579,927

 
 
 
 
 
 
Weighted average units outstanding—basic
266,955

 
269,084

 
271,745

Dilutive effect of compensatory options to buy AB Holding Units
430

 
554

 
1,037

Weighted average units outstanding—diluted
267,385

 
269,638

 
272,782

 
 
 
 
 
 
Basic net income per AB Unit
$
2.46

 
$
2.48

 
$
2.11

Diluted net income per AB Unit
$
2.45

 
$
2.47

 
$
2.10


We excluded 1,970,741 options in 2017, 2,873,106 options in 2016 and 2,409,499 options in 2015, from the diluted net income per unit computation due to their anti-dilutive effect.