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Net Income per Unit (Tables)
9 Months Ended
Sep. 30, 2018
Earnings Per Unit [Abstract]  
Schedule of Earnings Per Unit, Basic and Diluted
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 September 30,
 
Nine Months Ended
September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(in thousands, except per unit amounts)
 
 
 
 
 
 
 
 
 
Net income – basic
 
$
65,900

 
$
43,178

 
$
182,517

 
$
128,829

Additional allocation of equity in net income attributable to AB resulting from assumed dilutive effect of compensatory options
 
117

 
136

 
376

 
450

Net income – diluted
 
$
66,017

 
$
43,314

 
$
182,893

 
$
129,279

 
 
 
 
 
 
 
 
 
Weighted average units outstanding – basic
 
97,409

 
93,374

 
97,587

 
95,218

Dilutive effect of compensatory options
 
245

 
400

 
282

 
455

Weighted average units outstanding – diluted
 
97,654

 
93,774

 
97,869

 
95,673

 
 
 
 
 
 
 
 
 
Basic net income per unit
 
$
0.68

 
$
0.46

 
$
1.87

 
$
1.35

Diluted net income per unit
 
$
0.68

 
$
0.46

 
$
1.87

 
$
1.35