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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Reconciliation of the Numerators and Denominators Used in the Basic and Diluted Per-Share Computations
A reconciliation of the numerators and denominators used in the basic and diluted per-share computations is presented as follows for each class of common stock: 
Three months ended June 30,
20212020
(dollars in thousands, except per share data)Allocated net income (numerator)Weighted shares (denominator)Per-share amountAllocated net income (numerator)Weighted shares (denominator)Per-share amount
Class A – Basic EPS:
Income available to Class A stockholders$78,382 46,188,289 $1.70 $81,306 46,187,808 $1.76 
Dilutive effect of stock-based awards0 13,281 — 0 14,373 — 
Assumed conversion of Class B shares647 6,100,800 — 671 6,100,800 — 
Class A – Diluted EPS:
Income available to Class A stockholders on Class A equivalent shares
$79,029 52,302,370 $1.51 $81,977 52,302,981 $1.57 
Class B – Basic and diluted EPS:
Income available to Class B stockholders$647 2,542 $255 $671 2,542 $264 
Six months ended June 30,
20212020
(dollars in thousands, except per share data)Allocated net income (numerator)Weighted shares (denominator)Per-share amountAllocated net income (numerator)Weighted shares (denominator)Per-share amount
Class A – Basic EPS:
Income available to Class A stockholders$151,346 46,188,573 $3.28 $140,146 46,188,299 $3.03 
Dilutive effect of stock-based awards0 19,790 — 0 24,568 — 
Assumed conversion of Class B shares1,249 6,100,800 — 1,157 6,100,800 — 
Class A – Diluted EPS:
Income available to Class A stockholders on Class A equivalent shares
$152,595 52,309,163 $2.92 $141,303 52,313,667 $2.70 
Class B – Basic and diluted EPS:
Income available to Class B stockholders$1,249 2,542 $491 $1,157 2,542 $455