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Net Income Per Unit
 12 Months Ended
Dec. 31, 2019
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 limited partnership 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 limited partnership units outstanding for each year.
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
(in thousands, except per unit amounts)
Net income attributable to AB Unitholders
$
752,042

 
$
757,588

 
$
662,403

 
 
 
 
 
 
Weighted average units outstanding—basic
268,075

 
269,236

 
266,955

Dilutive effect of compensatory options to buy AB Holding Units
44

 
251

 
430

Weighted average units outstanding—diluted
268,119

 
269,487

 
267,385

 
 
 
 
 
 
Basic net income per AB Unit
$
2.78

 
$
2.79

 
$
2.46

Diluted net income per AB Unit
$
2.78

 
$
2.78

 
$
2.45


We excluded 29,056 options in 2019, 49,784 options in 2018 and 1,970,741 options in 2017, from the diluted net income per unit computation due to their anti-dilutive effect.