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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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
June 30,		Six Months Ended
June 30,
2022202120222021
(Dollars in thousands, except per share amounts)
Numerator
Net income$189,542 $154,352 $337,963 $265,042 
Less: distributed earnings allocated to participating securities(161)(133)(355)(291)
Less: undistributed earnings allocated to participating securities(689)(589)(1,261)(1,067)
Net income attributable to common stockholders (numerator for basic earnings per share)188,692 153,630 336,347 263,684 
Add back: undistributed earnings allocated to participating securities689 589 1,261 1,067 
Less: undistributed earnings reallocated to participating securities(676)(569)(1,231)(1,032)
Numerator for diluted earnings per share under two class method$188,705 $153,650 $336,377 $263,719 
Denominator
Weighted-average common shares outstanding70,841,476 70,291,057 70,804,019 70,044,326 
Add: dilutive effect of stock options1,406,274 2,424,216 1,738,041 2,394,887 
Add: dilutive effect of contingently issuable equity awards633,262 — 403,688 314,928 
Denominator for diluted earnings per share under two class method72,881,012 72,715,273 72,945,748 72,754,141 
Basic Earnings Per Common Share$2.66 $2.19 $4.75 $3.76 
Diluted Earnings Per Common Share$2.59 $2.11 $4.61 $3.62