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Shareholders' Equity
 3 Months Ended
Mar. 31, 2024
Stockholders' Equity Note [Abstract]  
Shareholders' Equity Shareholders' Equity
a) The Company has 50,000,000 shares of no par value common stock authorized. The following table presents a rollforward of changes in common shares issued and outstanding.

Three Months Ended March 31,
(shares in ones)
20242023
Issued and outstanding common shares, beginning of period13,131,672 13,422,692 
Issuance of common shares1,384 1,817 
Repurchase of common shares(109,545)(62,896)
Issued and outstanding common shares, end of period13,023,511 13,361,613 

b) The Company also has 10,000,000 shares of no par value preferred stock authorized, of which 600,000 shares were issued and outstanding at March 31, 2024 and December 31, 2023.

c) Net income per common share was determined by dividing adjusted net income to common shareholders by the applicable weighted average common shares outstanding. Basic common shares outstanding include restricted stock units that are no longer subject to any contingencies for issuance, but for which corresponding shares have not been issued. Diluted net income per common share is computed by dividing adjusted net income to common shareholders by the weighted average number of common shares and dilutive potential common shares outstanding during the period. The following table presents basic net income per common share and diluted net income per common share.

Three Months Ended March 31,
(in thousands, except per share amounts)20242023
Net income to common shareholders$1,025,184 $488,652 
Adjustment of redeemable noncontrolling interests(32,602)13,473 
Adjusted net income to common shareholders$992,582 $502,125 
Basic common shares outstanding13,137 13,450 
Dilutive potential common shares from restricted stock units and restricted stock
22 25 
Diluted common shares outstanding13,159 13,475 
Basic net income per common share$75.56 $37.33 
Diluted net income per common share
$75.43 $37.26