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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 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 March 31,
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$72,964 46,188,860 $1.58 $58,840 46,188,789 $1.27 
Dilutive effect of stock-based awards26,298 — 34,761 — 
Assumed conversion of Class B shares602 6,100,800 — 486 6,100,800 — 
Class A – Diluted EPS:
Income available to Class A stockholders on Class A equivalent shares
$73,566 52,315,958 $1.41 $59,326 52,324,350 $1.13 
Class B – Basic and diluted EPS:
Income available to Class B stockholders$602 2,542 $237 $486 2,542 $191