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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2022
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,
2022202120222021
(Dollars in thousands, except per share amounts)
Numerator
Net income$144,400 $145,954 $482,363 $410,996 
Less: distributed earnings allocated to participating securities(180)(155)(535)(446)
Less: undistributed earnings allocated to participating securities(522)(602)(1,784)(1,668)
Net income attributable to common stockholders (numerator for basic earnings per share)143,698 145,197 480,044 408,882 
Add back: undistributed earnings allocated to participating securities522 602 1,784 1,668 
Less: undistributed earnings reallocated to participating securities(513)(584)(1,745)(1,615)
Numerator for diluted earnings per share under two class method$143,707 $145,215 $480,083 $408,935 
Denominator
Weighted-average common shares outstanding70,880,405 70,301,085 70,829,761 70,130,853 
Add: dilutive effect of stock options1,189,243 2,202,045 1,573,814 2,330,667 
Add: dilutive effect of contingently issuable equity awards659,805 296,881 489,060 308,912 
Denominator for diluted earnings per share under two class method72,729,453 72,800,011 72,892,635 72,770,432 
Basic Earnings Per Common Share$2.03 $2.07 $6.78 $5.83 
Diluted Earnings Per Common Share$1.98 $1.99 $6.59 $5.62