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Earnings Per Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share Earnings per Share
The following table provides a reconciliation of the numerators and denominators of basic and diluted earnings per share ("EPS"):
2021IncomeSharesPer Share
($ in thousands, except per share amounts)(Numerator)(Denominator)Amount
Basic EPS:   
Net income available to common stockholders$394,484 60,183 $6.55 
Effect of dilutive securities:   
Stock compensation plans— 484  
Diluted EPS:   
Net income available to common stockholders$394,484 60,667 $6.50 
2020IncomeSharesPer Share
($ in thousands, except per share amounts)(Numerator)(Denominator)Amount
Basic EPS:   
Net income available to common stockholders$246,355 59,862 $4.12 
Effect of dilutive securities:   
Stock compensation plans— 431  
Diluted EPS:   
Net income available to common stockholders$246,355 60,293 $4.09 

2019IncomeSharesPer Share
($ in thousands, except per share amounts)(Numerator)(Denominator)Amount
Basic EPS:   
Net income available to common stockholders$271,623 59,421 $4.57 
Effect of dilutive securities:   
Stock compensation plans— 583  
Diluted EPS:   
Net income available to common stockholders$271,623 60,004 $4.53