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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2023
Stockholders' Equity Note [Abstract]  
Schedule of Common Stock Outstanding Roll Forward 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.
Years Ended December 31,
(in thousands)20232022
Issued and outstanding common shares, beginning of year13,423 13,632 
Issuance of common shares31 24 
Repurchase of common shares(322)(233)
Issued and outstanding common shares, end of year13,132 13,423 
Schedule Of Net Income Per Common Share The following table presents net income (loss) per common share and diluted net income (loss) per common share.
Years Ended December 31,
(in thousands, except per share amounts)202320222021
Net income (loss) to common shareholders
$1,960,060 $(252,277)$2,387,135 
Adjustment of redeemable noncontrolling interests6,212 (69,896)46,874 
Adjusted net income (loss) to common shareholders
$1,966,272 $(322,173)$2,434,009 
Basic common shares outstanding13,347 13,580 13,768 
Dilutive potential common shares from restricted stock units and restricted stock (1) (2)
31 — 32 
Diluted common shares outstanding13,378 13,580 13,800 
Basic net income (loss) per common share$147.32 $(23.72)$176.79 
Diluted net income (loss) per common share (1) (2)
$146.98 $(23.72)$176.38 
(1)    The Company has issued grants and awards of restricted stock units to employees as performance, retention or hiring incentives, as well as awards of restricted stock to non-employee directors, under its equity incentive compensation plan. At December 31, 2023, there were 86,144 shares available for future awards under the Company's equity incentive compensation plan.
(2)    The impact of 33 thousand shares from restricted stock units and restricted stock was excluded from the computation of diluted net loss per common share for the year ended December 31, 2022 because the effect would have been anti-dilutive.