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Net Income per Unit
6 Months Ended
Jun. 30, 2019
Earnings Per Unit [Abstract]  
Net Income per Unit
Net Income per Unit

Basic net income per unit is derived by dividing net income by the basic weighted average number of units outstanding for each period. Diluted net income per unit is derived by adjusting net income for the assumed dilutive effect of compensatory options (“Net income – diluted”) and dividing by the diluted weighted average number of units outstanding for each period.

 
 
Three Months Ended June 30,
 
Six Months Ended
June 30,
 
 
2019
 
2018
 
2019
 
2018
 
 
(in thousands, except per unit amounts)
 
 
 
 
 
 
 
 
 
Net income – basic
 
$
52,274

 
$
58,457

 
$
98,713

 
$
116,617

Additional allocation of equity in net income attributable to AB resulting from assumed dilutive effect of compensatory options
 
19

 
115

 
45

 
259

Net income – diluted
 
$
52,293

 
$
58,572

 
$
98,758

 
$
116,876

 
 
 
 
 
 
 
 
 
Weighted average units outstanding – basic
 
96,283

 
98,368

 
95,717

 
97,673

Dilutive effect of compensatory options
 
48

 
272

 
60

 
303

Weighted average units outstanding – diluted
 
96,331

 
98,640

 
95,777

 
97,976

 
 
 
 
 
 
 
 
 
Basic net income per unit
 
$
0.54

 
$
0.59

 
$
1.03

 
$
1.19

Diluted net income per unit
 
$
0.54

 
$
0.59

 
$
1.03

 
$
1.19



For both the three and six months ended June 30, 2019, we excluded 29,056 options from the diluted net income computation due to their anti-dilutive effect. For the three and six months ended June 30, 2018, we excluded 850,155 options and 1,211,906 options, respectively, from the diluted net income computation due to their anti-dilutive effect.