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Earnings per Share
 9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Earnings Per Share EARNINGS PER SHARE (EPS)
Basic EPS is based on the weighted average number of common shares outstanding for the period, excluding any dilutive common share equivalents. Diluted EPS reflects the potential dilution resulting from the vesting of outstanding restricted stock awards, restricted stock units, performance stock units and stock options. The following table shows the computation of basic and diluted EPS for the three and nine month periods ended September 30, 2024 and 2023, respectively:

Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Numerator:
Net income attributable to ACIC common stockholders$28,119 $10,568 $70,772 $295,627 
Denominator:
Weighted-average shares outstanding48,066,358 43,301,388 47,742,744 43,220,084 
Effect of dilutive securities1,454,888 841,305 1,512,327 668,581 
Weighted-average diluted shares49,521,246 44,142,693 49,255,071 43,888,665 
Earnings available to ACIC common stockholders per share
Basic
$0.59 $0.24 $1.49 $6.84 
Diluted
$0.57 $0.24 $1.44 $6.73 

See Note 16 of these Notes to Unaudited Condensed Consolidated Financial Statements for additional information on the stock grants related to dilutive securities.