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Shareholders' Equity
 9 Months Ended
Sep. 30, 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.

Quarter Ended September 30, Nine Months Ended September 30,
(shares in ones)
2024202320242023
Issued and outstanding common shares, beginning of period12,962,032 13,284,998 13,131,672 13,422,692 
Issuance of common shares5,324 3,007 9,311 5,475 
Repurchase of common shares(80,379)(56,483)(254,006)(196,645)
Issued and outstanding common shares, end of period12,886,977 13,231,522 12,886,977 13,231,522 

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 September 30, 2024 and December 31, 2023. The Company declared and paid dividends on preferred shares of $18.0 million, or $30 per share, in the second quarters of both 2024 and 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.

Quarter Ended September 30, Nine Months Ended September 30,
(in thousands, except per share amounts)2024202320242023
Net income to common shareholders$904,959 $42,591 $2,179,844 $1,208,754 
Adjustment of redeemable noncontrolling interests(42,565)(628)(81,267)7,087 
Adjusted net income to common shareholders$862,394 $41,963 $2,098,577 $1,215,841 
Basic common shares outstanding12,987 13,315 13,058 13,382 
Dilutive potential common shares from restricted stock units and restricted stock
30 30 24 24 
Diluted common shares outstanding13,017 13,345 13,082 13,406 
Basic net income per common share$66.40 $3.15 $160.71 $90.86 
Diluted net income per common share
$66.25 $3.14 $160.42 $90.69