Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Common Stock Class B	Treasury Stock	Treasury Stock Class B	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance at beginning of period at Dec. 31, 2020	$ 707,541	$ 194	$ 548	$ (47,844)	$ (47,080)	$ 647,602	$ (7,460)	$ 161,581
Increase (Decrease) in Stockholders' Equity
Issuance of common stock	44					44
Share conversion - Class B to A		2	(2)
Repurchase of shares	(7,122)			(7,122)
Shares withheld related to net settlement of equity awards	(10,916)				(10,916)
Vesting of restricted share grants			9			(9)
Exercise of options	790		1			789
Share-based compensation	5,547					5,547
Dividends paid	(6,481)							(6,481)
Net income	65,202							65,202
Other comprehensive income	10,771						10,771
Balance at end of period at Mar. 31, 2021	765,376	196	$ 556	(54,966)	$ (57,996)	653,973	3,311	220,302
Balance at beginning of period at Dec. 31, 2021	929,927	772		(153,200)		673,572	5,972	402,811
Increase (Decrease) in Stockholders' Equity
Issuance of common stock	69					69
Repurchase of shares	(9,437)			(9,437)
Shares withheld related to net settlement of equity awards	(9,317)			(9,317)
Vesting of restricted share grants		5				(5)
Exercise of options	1,233	2				1,231
Share-based compensation	3,945					3,945
Dividends paid	(17,618)							(17,618)
Net income	71,273							71,273
Other comprehensive income	16,199						16,199
Balance at end of period at Mar. 31, 2022	$ 986,274	$ 779		$ (171,954)		$ 678,812	$ 22,171	$ 456,466