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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Reconciliation of Earnings Per Share
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 

2018IncomeSharesPer Share
($ in thousands, except per share amounts)(Numerator)(Denominator)Amount
Basic EPS:   
Net income available to common stockholders$178,939 58,950 $3.04 
Effect of dilutive securities:   
Stock compensation plans— 763  
Diluted EPS:   
Net income available to common stockholders$178,939 59,713 $3.00