Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income
Balance, beginning of year, shares at Dec. 31, 2021		1,895
Balance, beginning of year at Dec. 31, 2021	$ 229,087	$ 0	$ 225,861	$ 3,226
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	23,903		23,903
Dividends	(9,181)		(9,181)
Shares of common stock repurchased and retired (in shares)		(1)
Shares of common stock repurchased and retired	(133)		(133)
Exercise of stock appreciation rights (in shares)		3
Exercise of stock appreciation rights	(1)		(1)
Share-based compensation expense related to stock appreciation rights	362		362
Accumulated postretirement benefit obligation adjustment	180			180
Net unrealized gain (loss) on investments	(3,206)			(3,206)
Balance, end of year, shares at Dec. 31, 2022		1,897
Balance, end of year at Dec. 31, 2022	241,011	$ 0	240,811	200
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	21,686		21,686
Dividends	(11,048)		(11,048)
Shares of common stock repurchased and retired (in shares)		(7)
Shares of common stock repurchased and retired	(959)		(959)
Exercise of stock appreciation rights (in shares)		1
Exercise of stock appreciation rights	0		0
Share-based compensation expense related to stock appreciation rights	425		425
Accumulated postretirement benefit obligation adjustment	19			19
Net unrealized gain (loss) on investments	419			419
Balance, end of year, shares at Dec. 31, 2023		1,891
Balance, end of year at Dec. 31, 2023	$ 251,553	$ 0	$ 250,915	$ 638