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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2021
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. The table below shows our basic and diluted EPS calculations.
Three Months Ended
June 30,		Six Months Ended
June 30,
2021202020212020
(Dollars in thousands, except per share amounts)
Numerator
Net income$154,352 $84,396 $265,042 $121,156 
Less: distributed earnings allocated to participating securities(133)(121)(291)(256)
Less: undistributed earnings allocated to participating securities(589)(363)(1,067)(465)
Net income attributable to common stockholders (numerator for basic earnings per share)153,630 83,912 263,684 120,435 
Add back: undistributed earnings allocated to participating securities589 363 1,067 465 
Less: undistributed earnings reallocated to participating securities(569)(357)(1,032)(455)
Numerator for diluted earnings per share under two class method$153,650 $83,918 $263,719 $120,445 
Denominator
Weighted-average common shares outstanding70,291,057 68,057,093 70,044,326 67,775,735 
Add: dilutive effect of stock options2,424,216 1,150,322 2,394,887 1,614,428 
Add: dilutive effect of performance share units— — 314,928 311,779 
Denominator for diluted earnings per share under two class method72,715,273 69,207,415 72,754,141 69,701,942 
Basic Earnings Per Common Share$2.19 $1.23 $3.76 $1.78 
Diluted Earnings Per Common Share$2.11 $1.21 $3.62 $1.73