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Net Income Per Common Share
 12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Net Income Per Common Share Net Income Per Common Share
    Basic net income per common share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Weighted average common shares outstanding for the basic net income per common share calculation includes certain vested restricted stock units (RSUs) and performance stock units (PSUs) as there are no conditions under which those shares will not be issued. For more information about common share activity during the period, see Note 12, Stockholders' Equity. Diluted net income per common share is computed by dividing net income by the combination of the weighted average number of common shares outstanding during the period and other potentially dilutive weighted average common shares. Other potentially dilutive weighted average common shares include the dilutive effect of stock options, RSUs, and PSUs for each period using the treasury stock method. Under the treasury stock method, the exercise price of a share and the amount of compensation expense, if any, for future service that has not yet been recognized are assumed to be used to repurchase shares in the current period.
    The following table sets forth the computation of basic and diluted net income per common share:
 Year Ended December 31
 202420232022
 (thousands, except per-share data)
Net income$376,354 $483,656 $857,658 
Weighted average common shares outstanding during the period (for basic calculation)39,086 39,649 39,526 
Dilutive effect of other potential common shares232 252 246 
Weighted average common shares and potential common shares (for diluted calculation)39,318 39,901 39,772 
Net income per common share - Basic$9.63 $12.20 $21.70 
Net income per common share - Diluted$9.57 $12.12 $21.56 

    The computation of the dilutive effect of other potential common shares excludes stock awards representing an insignificant number of shares of common stock in the years ended December 31, 2024 and 2023, and 0.1 million shares of common stock in the year ended December 31, 2022. Under the treasury stock method, the inclusion of these stock awards would have been antidilutive.