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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2022
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 for the three and six months ended June 30, 2022 and 2021 were as follows:
For the Three Months Ended June 30,For the Six Months Ended June 30,
Basic and Diluted Earnings Per Share2022202120222021
Numerator:
Net income attributable to APAM$44,279 $88,207 $109,712 $165,485 
Less: Allocation to participating securities5,903 8,765 15,265 15,120 
Net income available to common stockholders$38,376 $79,442 $94,447 $150,365 
Denominator:
Basic weighted average shares outstanding62,320,372 59,821,804 62,180,483 59,292,982 
Dilutive effect of nonparticipating share-based awards30,011 16,570 30,665 15,777 
Diluted weighted average shares outstanding62,350,383 59,838,374 62,211,148 59,308,759 
Earnings per share - Basic $0.62 $1.33 $1.52 $2.54 
Earnings per share - Diluted$0.62 $1.33 $1.52 $2.54 
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 June 30,For the Six Months Ended June 30,
Anti-Dilutive Weighted Average Shares Outstanding2022202120222021
Holdings limited partnership units12,222,389 14,255,722 12,256,012 14,659,748 
Unvested restricted share-based awards5,690,631 5,577,070 5,546,840 5,463,556 
Total17,913,020 19,832,792 17,802,852 20,123,304