Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The net income available to common stockholders and weighted average number of common shares outstanding used to compute basic and diluted earnings per share for each class of common stock are as follows (in thousands, except per share amounts): 

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Distributed earnings	$	12,915	$	10,823	$	38,685	$	32,360
Undistributed earnings	16,824		17,114		49,681		40,909
Net income	$	29,739	$	27,937	$	88,366	$	73,269
Class A common stock:
Basic net income available to common stockholders	$	20,014	$	18,729	$	59,421	$	49,048
Basic weighted average common shares outstanding	27,139		26,822		27,071		26,706
Basic earnings per share	$	0.74	$	0.70	$	2.19	$	1.84
Diluted net income available to common stockholders	$	20,080	$	18,798	$	59,656	$	49,203
Effect of potential exercise of stock options	274		306		330		257
Diluted weighted average common shares outstanding	27,413		27,128		27,401		26,963
Diluted earnings per share	$	0.73	$	0.69	$	2.18	$	1.82
Class B common stock:
Basic net income available to common stockholders	$	9,725	$	9,208	$	28,945	$	24,221
Basic weighted average common shares outstanding	13,187		13,188		13,187		13,188
Basic earnings per share	$	0.74	$	0.70	$	2.19	$	1.84
Diluted net income available to common stockholders	$	9,659	$	9,139	$	28,710	$	24,066
Diluted weighted average common shares outstanding	13,187		13,188		13,187		13,188
Diluted earnings per share	$	0.73	$	0.69	$	2.18	$	1.82