Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2021

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):

	Year Ended December 31,
	2021		2020		2019
Distributed earnings	$	61,826	$	51,621	$	43,207
Undistributed earnings	75,191		68,909		70,683
Net income	$	137,017	$	120,530	$	113,890
Class A common stock:
Basic net income available to common stockholders	$	92,588	$	81,087	$	76,294
Basic weighted average common shares outstanding	27,459		27,105		26,763
Basic earnings per share	$	3.37	$	2.99	$	2.85
Diluted net income available to common stockholders	$	92,940	$	81,405	$	76,555
Effect of potential exercise of stock options	325		328		279
Diluted weighted average common shares outstanding	27,784		27,433		27,042
Diluted earnings per share	$	3.35	$	2.97	$	2.83
Class B common stock:
Basic net income available to common stockholders	$	44,429	$	39,443	$	37,596
Basic weighted average common shares outstanding	13,177		13,185		13,188
Basic earnings per share	$	3.37	$	2.99	$	2.85
Diluted net income available to common stockholders	$	44,077	$	39,125	$	37,335
Diluted weighted average common shares outstanding	13,177		13,185		13,188
Diluted earnings per share	$	3.35	$	2.97	$	2.83