Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method

The computation of basic and diluted earnings per share under the two-class method for the three and nine months ended September 30, 2017 and 2016 were as follows:

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
Basic and Diluted Earnings Per Share	2017		2016		2017		2016
Numerator:
Net income attributable to APAM	$	30,665	$	19,086	$	77,092	$	53,731
Less: Allocation to participating securities	2,654		3,407		12,086		10,294
Net income available to common stockholders	$	28,011	$	15,679	$	65,006	$	43,437
Denominator:
Weighted average shares outstanding	45,890,291		38,646,194		44,068,172		37,883,039
Earnings per share	$	0.61	$	0.41	$	1.48	$	1.15

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table summarizes the weighted-average shares outstanding that are excluded from the calculation of diluted earnings per share because their effect would have been anti-dilutive:

	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
Anti-Dilutive Weighted Average Shares Outstanding	2017	2016	2017	2016
Holdings limited partnership units	25,715,238	32,406,438	27,318,732	32,955,746
Unvested restricted share-based awards	4,189,441	3,590,680	4,200,142	3,622,230
Total	29,904,679	35,997,118	31,518,874	36,577,976