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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted To calculate diluted EPS, basic EPS is adjusted to include the effect of potentially dilutive stock options outstanding and contingently issuable equity awards. The table below shows our basic and diluted EPS calculations.
Three Months Ended
September 30,		Nine Months Ended
September 30,
2023202220232022
(Dollars in thousands, except per share amounts)
Numerator
Net income$107,305 $144,400 $281,498 $482,363 
Less: distributed earnings allocated to participating securities(248)(180)(651)(535)
Less: undistributed earnings allocated to participating securities(378)(522)(895)(1,784)
Net income attributable to common stockholders (numerator for basic earnings per share)106,679 143,698 279,952 480,044 
Add back: undistributed earnings allocated to participating securities378 522 895 1,784 
Less: undistributed earnings reallocated to participating securities(372)(513)(878)(1,745)
Numerator for diluted earnings per share under two-class method$106,685 $143,707 $279,969 $480,083 
Denominator
Weighted-average common shares outstanding74,198,016 70,880,405 73,265,878 70,829,761 
Add: dilutive effect of stock options1,249,797 1,189,243 1,426,970 1,573,814 
Add: dilutive effect of contingently issuable equity awards805,365 659,805 413,508 489,060 
Denominator for diluted earnings per share under two-class method76,253,178 72,729,453 75,106,356 72,892,635 
Basic Earnings Per Common Share$1.44 $2.03 $3.82 $6.78 
Diluted Earnings Per Common Share$1.40 $1.98 $3.73 $6.59