Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

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,
	2019					2018
(dollars in thousands, except per share data)	Allocated net income (numerator)		Weighted shares (denominator)	Per-share amount		Allocated net income (numerator)		Weighted shares (denominator)	Per-share amount
Class A – Basic EPS:
Income available to Class A stockholders	$	74,694	46,188,337	$	1.62	$	65,220	46,187,908	$	1.41
Dilutive effect of stock-based awards	0		22,899	—		0		21,920	—
Assumed conversion of Class B shares	617		6,100,800	—		538		6,100,800	—
Class A – Diluted EPS:
Income available to Class A stockholders on Class A equivalent shares	$	75,311	52,312,036	$	1.44	$	65,758	52,310,628	$	1.26
Class B – Basic and diluted EPS:
Income available to Class B stockholders	$	617	2,542	$	243	$	538	2,542	$	212