Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income
Balance, beginning of period, shares at Dec. 31, 2022		1,897
Balance, beginning of period at Dec. 31, 2022	$ 241,011	$ 0	$ 240,811	$ 200
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,181		1,181
Dividends paid	(873)		(873)
Exercise of stock appreciation rights (in shares)		1
Exercise of stock appreciation rights	0		0
Share-based compensation expense related to stock appreciation rights	159		159
Accumulated postretirement benefit obligation adjustment	111			111
Net unrealized gain (loss) on investments	249			249
Balance, end of period, shares at Mar. 31, 2023		1,898
Balance, end of period at Mar. 31, 2023	241,838	$ 0	241,278	560
Balance, beginning of period, shares at Dec. 31, 2023		1,891
Balance, beginning of period at Dec. 31, 2023	251,553	$ 0	250,915	638
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,525		4,525
Dividends paid	(867)		(867)
Treasury Stock, Shares, Acquired		(7)
Repurchases of common stock	(1,053)		(1,053)
Share-based compensation expense related to stock appreciation rights	96		96
Accumulated postretirement benefit obligation adjustment	0
Net unrealized gain (loss) on investments	(292)			(292)
Balance, end of period, shares at Mar. 31, 2024		1,884
Balance, end of period at Mar. 31, 2024	$ 253,962	$ 0	$ 253,616	$ 346