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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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
June 30,		Six Months Ended
June 30,
2023202220232022
(Dollars in thousands, except per share amounts)
Numerator
Net income$93,493 $189,542 $174,193 $337,963 
Less: distributed earnings allocated to participating securities(187)(161)(403)(355)
Less: undistributed earnings allocated to participating securities(291)(689)(522)(1,261)
Net income attributable to common stockholders (numerator for basic earnings per share)93,015 188,692 173,268 336,347 
Add back: undistributed earnings allocated to participating securities291 689 522 1,261 
Less: undistributed earnings reallocated to participating securities(285)(676)(511)(1,231)
Numerator for diluted earnings per share under two-class method$93,021 $188,705 $173,279 $336,377 
Denominator
Weighted-average common shares outstanding72,934,920 70,841,476 72,793,951 70,804,019 
Add: dilutive effect of stock options1,620,982 1,406,274 1,496,963 1,738,041 
Add: dilutive effect of contingently issuable equity awards400,124 633,262 209,575 403,688 
Denominator for diluted earnings per share under two-class method74,956,026 72,881,012 74,500,489 72,945,748 
Basic Earnings Per Common Share$1.28 $2.66 $2.38 $4.75 
Diluted Earnings Per Common Share$1.24 $2.59 $2.33 $4.61