Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands		Total	Common Stock	Additional paid-in capital	Retaining Earnings	Accumulated other comprehensive income (loss)
Balance, beginning (in shares) at Dec. 31, 2022			25,210,541
Beginning balance at Dec. 31, 2022		$ 740,114	$ 25	$ 207,030	$ 620,555	$ (87,496)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		694			694
Stock based compensation (in shares)			21,012
Stock based compensation		980		980
Dividends on common stock		(4,037)			(4,037)
Change in net unrealized investment gain (loss)	[1]	14,650				14,650
Change in liability for underfunded employee benefit plans	[2]	(607)				(607)
Balance, ending (in shares) at Mar. 31, 2023			25,231,553
Ending balance at Mar. 31, 2023		751,795	$ 25	208,010	617,213	(73,453)
Balance, beginning (in shares) at Dec. 31, 2022			25,210,541
Beginning balance at Dec. 31, 2022		740,114	$ 25	207,030	620,555	(87,496)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(49,308)
Foreign currency translation adjustment		0
Balance, ending (in shares) at Sep. 30, 2023			25,263,742
Ending balance at Sep. 30, 2023		644,937	$ 25	209,931	559,126	(124,145)
Balance, beginning (in shares) at Mar. 31, 2023			25,231,553
Beginning balance at Mar. 31, 2023		751,795	$ 25	208,010	617,213	(73,453)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(56,382)			(56,382)
Stock based compensation (in shares)			31,396
Stock based compensation		977		977
Dividends on common stock		(4,042)			(4,042)
Change in net unrealized investment gain (loss)	[1]	(15,376)				(15,376)
Change in liability for underfunded employee benefit plans	[2]	(606)				(606)
Balance, ending (in shares) at Jun. 30, 2023			25,262,949
Ending balance at Jun. 30, 2023		676,366	$ 25	208,987	556,789	(89,435)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		6,380			6,380
Stock based compensation (in shares)			793
Stock based compensation		944		944
Dividends on common stock		(4,042)			(4,042)
Change in net unrealized investment gain (loss)	[1]	(34,103)				(34,103)
Change in liability for underfunded employee benefit plans	[2]	(607)				(607)
Foreign currency translation adjustment		0
Balance, ending (in shares) at Sep. 30, 2023			25,263,742
Ending balance at Sep. 30, 2023		$ 644,937	$ 25	209,931	559,126	(124,145)
Balance, beginning (in shares) at Dec. 31, 2023		25,269,842	25,269,842
Beginning balance at Dec. 31, 2023		$ 733,745	$ 25	209,986	574,691	(50,957)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		13,502			13,502
Stock based compensation (in shares)			23,314
Stock based compensation		900		900
Dividends on common stock		(4,046)			(4,046)
Change in net unrealized investment gain (loss)	[3]	(6,740)				(6,740)
Change in liability for underfunded employee benefit plans	[4]	(572)				(572)
Foreign currency translation adjustment		(23)				(23)
Balance, ending (in shares) at Mar. 31, 2024			25,293,156
Ending balance at Mar. 31, 2024		$ 736,766	$ 25	210,886	584,147	(58,292)
Balance, beginning (in shares) at Dec. 31, 2023		25,269,842	25,269,842
Beginning balance at Dec. 31, 2023		$ 733,745	$ 25	209,986	574,691	(50,957)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		30,515
Foreign currency translation adjustment		$ 865
Balance, ending (in shares) at Sep. 30, 2024		25,341,248	25,341,248
Ending balance at Sep. 30, 2024		$ 785,823	$ 25	213,374	593,052	(20,628)
Balance, beginning (in shares) at Mar. 31, 2024			25,293,156
Beginning balance at Mar. 31, 2024		736,766	$ 25	210,886	584,147	(58,292)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(2,735)			(2,735)
Stock based compensation (in shares)			42,947
Stock based compensation		1,441		1,441
Dividends on common stock		(4,053)			(4,053)
Change in net unrealized investment gain (loss)	[3]	(4,287)				(4,287)
Change in liability for underfunded employee benefit plans	[4]	(572)				(572)
Foreign currency translation adjustment		35				35
Balance, ending (in shares) at Jun. 30, 2024			25,336,103
Ending balance at Jun. 30, 2024		726,595	$ 25	212,327	577,359	(63,116)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		19,748			19,748
Stock based compensation (in shares)			5,145
Stock based compensation		1,047		1,047
Dividends on common stock		(4,055)			(4,055)
Change in net unrealized investment gain (loss)	[3]	42,207				42,207
Change in liability for underfunded employee benefit plans	[4]	(572)				(572)
Foreign currency translation adjustment		$ 853				853
Balance, ending (in shares) at Sep. 30, 2024		25,341,248	25,341,248
Ending balance at Sep. 30, 2024		$ 785,823	$ 25	$ 213,374	$ 593,052	$ (20,628)

[1] The change in net unrealized gain (loss) is net of reclassification adjustments and income taxes.

[2] The change in liability for underfunded employee benefit plans is net of reclassification adjustments and income taxes.

[3] The change in net unrealized gain (loss) is net of reclassification adjustments and income taxes.

[4] The change in liability for underfunded employee benefit plans is net of reclassification adjustments and income taxes.