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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Computation of basic and diluted net income (loss) per share

The computation of basic and diluted earnings per share under the two-class method for the years ended December 31, 2019, 2018 and 2017 were as follows:

			For the Years Ended December 31,
Basic and Diluted Earnings Per Share			2019						2018						2017
Numerator:
Net income attributable to APAM			$	156,536					$	158,309					$	49,599
Less: Allocation to participating securities			21,154						19,447						16,026
Net income available to common stockholders			$	135,382					$	138,862					$	33,573
Denominator:
Weighted average shares outstanding			51,127,929						48,862,435						44,647,318
Earnings per share			$	2.65					$	2.84					$	0.75

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 Years Ended December 31,
Anti-Dilutive Weighted Average Shares Outstanding			2019						2018						2017
Holdings limited partnership units			21,827,809						23,351,440						26,837,118
Unvested restricted share-based awards			5,026,357						4,813,895						4,153,260
Total			26,854,166						28,165,335						30,990,378

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- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

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Tabular disclosure of the effect of income (loss) on basic earnings per share.

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