CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	Common Stock Class A Common shares	Common Stock Class B Common shares	Common Stock	Additional Paid In Capital	Retained Earnings Class A Common shares	Retained Earnings Class B Common shares	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Class A Common shares	Class B Common shares	Total
Balance at beginning of period at Dec. 31, 2023			$ 4,553	$ 142,124			$ 786,487	$ (20,408)			$ 912,756
Balance (in shares) at Dec. 31, 2023	17,203	2,155
Increase (Decrease) in Stockholders' Equity
Net income							30,606				30,606
Net change in AOCI								486			486
Dividends declared on Common Stock:
Dividends declared on Common Stock					$ (6,986)	$ (796)			$ (6,986)	$ (796)
Stock options exercised, net of shares withheld			26	(689)			(437)				(1,100)
Stock options exercised, net of shares withheld (in shares)	37
Conversion of Class B to Class A Common Shares (in shares)	4	(4)
Deferred director compensation expense - Class A Common Stock			(1)	135							134
Deferred designed key employee compensation expense - Class A Common Stock				167							167
Deferred designed key employee compensation expense - Class A Common Stock (In shares)	11
Employee stock purchase plan - Class A Common Stock			1	183							184
Employee stock purchase plan - Class A Common Stock (in shares)	4
Stock-based awards, Performance stock units				36							36
Stock-based awards, Restricted stock, net of shares withheld			(1)	(34)			(38)				(73)
Stock-based awards, Restricted stock, net of shares withheld (in shares)	1
Stock-based awards, Stock options				169							169
Balance at end of period at Mar. 31, 2024			4,578	142,091			808,836	(19,922)			935,583
Balance (in shares) at Mar. 31, 2024	17,260	2,151
Balance at beginning of period at Dec. 31, 2024			4,587	148,053			853,627	(14,238)			992,029
Balance (in shares) at Dec. 31, 2024	17,298	2,150
Increase (Decrease) in Stockholders' Equity
Net income							47,268				47,268
Net change in AOCI								2,573			2,573
Dividends declared on Common Stock:
Dividends declared on Common Stock					$ (7,799)	$ (882)			$ (7,799)	$ (882)
Stock options exercised, net of shares withheld			8	2,671			(2,304)				375
Stock options exercised, net of shares withheld (in shares)	36
Net change in notes receivable on Class A Common Stock				(48)							(48)
Deferred director compensation expense - Class A Common Stock				143							143
Deferred designed key employee compensation expense - Class A Common Stock			(1)	269			(179)				89
Deferred designed key employee compensation expense - Class A Common Stock (In shares)	18
Employee stock purchase plan - Class A Common Stock			1	176							177
Employee stock purchase plan - Class A Common Stock (in shares)	3
Stock-based awards, Performance stock units				36							36
Stock-based awards, Restricted stock, net of shares withheld			(1)	17			(44)				(28)
Stock-based awards, Restricted stock, net of shares withheld (in shares)	13
Stock-based awards, Stock options				156							156
Balance at end of period at Mar. 31, 2025			$ 4,594	$ 151,473			$ 889,687	$ (11,665)			$ 1,034,089
Balance (in shares) at Mar. 31, 2025	17,368	2,150